Possible seizure disorder

Between February and March of this year, my Monk parakeet, Freddy, started to show some concerning symptoms, by suddenly falling from his perch, particularly in the evenings. When he tried to fly he got tired right away and he would end up hitting the ground, breathing heavily and feeling very weak.
I took him to the veterinarian right away, he ran some tests that showed that his liver values were high. He advised, as a preventive measure, to treat him with an antibiotic for one week (Synulox), plus Legalon as a disintoxicant, and Rossovet to help with the asthenia. After a few days I found him in a pool of blood, with his fingernails bitten off an in a very nervous state. At that point, my veterinarian prescribed a collar, and after tree days, after being separated from my other Monk parakeet, he overcame his obsessive phase towards his feet. But he wasn’t otherwise improving, and I left him at the veterinary clinic for some more thorough exams, including an x-ray that showed some unclear contents in his stomach, that look like small stones (I never feed him grit, except maybe several years ago for a brief period).

By April, Freddy continued with a disintoxicant treatment (Detoxicum), and I kept feeding him with some baby formula to help him keep his strength. He suffered from convulsions that made him fall sideways from the perch, with his wings open and often with one wing that remained stuck upwards. It happened also at night, I would get up, picked him up to try to calm him down, he would recover from these seizures after a few minutes. He went back to the clinic, were he was treated for five days for a suspected heavy metal poisoning. There were no improvements with this treatment, and hi appetite was reduced. After a month of Detoxicum, I changed his diet, switching from the Versele Laga formula, to finely ground Roudybush pellets formulated with a low level of proteins, and a higher mineral and vitamin contents fed with a syringe. Since this change, his asthenic state has improved, and days in which he feels strongly depressed have been reduced. But he is still not well, and his ataxia is still present.

There are days in which he feels better, while in others he is very weak. Currently I am waiting to have more tests done. I don’t have many hopes for his recovery. I fear that he has suffered some irreversible neurovegetative damages, but we don’t know what caused them. Mycotoxins? Heavy metals? For years he shared the same cage and food with his companion, but only Freddy became ill. Although, between the two, Freddy has always been the one more eager to eat the sunflower seeds, and when he was nervous he would bite the cage bars. But I am not satisfied of these explanations. Moreover, I only gave him some sunflower seeds in the last period before he became ill, and not for years.

I lowered the perches in his cage. The tips of his fingernails haven’t grown back. Maybe he still chews them, or he might have damaged them too much to regrow. He doesn’t have a strong hold on the perch, because of the short nails but also for his ataxia that never leaves him. He is always apathic. He responds when I cuddle him and talk to him, asking him to eat his boiled grains and vegetables, and at times he seems to have better reactions. While in other days, he is very still, and I can tell that he is scared and confused by the problems that limit his movements. Fortunately, he didn’t have more seizures. He suffers from polyuria, and he has difficulties in expelling his feces when he is weaker and more ataxic, flattening himself but not finding the right position. He starts feeling better in the afternoon/evening, while the mornings are the worst part of the day for him. I am very concerned about subjecting him to more invasive tests, such as a biopsy or an endoscopy. My veterinarian clearly explained that the mortality rates with these tests on birds in Freddy’s conditions are almost 100%.
I would be very grateful for an opinion.

Sonia, I am truly sorry to hear of the suffering your bird is going through. It seems that you have some sort of a seizure disorder, but it is not clearly apparent as to the primary cause from your description. Here are some basic suggestions: You may ask your veterinarian if they could suggest a colleague for referral for more advanced diagnostic evaluation. Those steps may include some repeat of the blood testing that has been previously performed, or advanced imaging studies.
I am not familiar with the specific make up of the brand names of the drugs you mentioned, so cannot comment on what they may be being used for, or what potential adverse effects that they could possibly bring, unfortunately. A reasonable goal to consider here would be to pursue input that may help clarify diagosis of this condition, and/or information that may help you improve the quality of life of your bird symptomatically, and these questions need to be discussed in-depth with your attending veterinarian or the specialist that you are referred to.