Ginip mama

Hello, need help and suggestions pls. Only one exotic pet vet some distance from my home and they gave anti inflammatory that's not doing anything and my otherwise very meek and mild budgie, ginip screams and tries to run but more like stumbles away from me because i have to cover him in order to pick him up and give him the anti inflammatory...before being sick, I would say up-up and he would jump onto my hand and settle himself onto a finger ready for a walk around the house. He liked to look around all over as I walked him around...he never bit me and started to play with his toys..loved his treats and groomed himself all the time. Etc...then he slowly started to lose his balance and fell off perch and I started to drop the ropes and perches until they were flat on the floor..now i pad the floor with cardboard then cover with t-shirts. Was given anti inflammatory and but that does nothing for him...now he cannot step onto his favorite rope even on the ground..he just sits on the ground on his elbow not feet as they slip wide apart and he end up sitting on his body, head bow...I moved him from big cage to smaller cage..14x20 cage ..his beak is overgrown eventhough I gave him two bones and he is beside my bed...i heard him use to bones but yet it's overgrown...he refused the treats some time ago as he deteriorated which is extremely unusual. Now i see when he goes to drink water his goes into like a shock and flaps his wings rolling all over on floor. He cannot sleep or find a position to sleep ..he goes into corners to brace he tries everything to be able to sleep he loses balance and keels forward and wakes up...he tries to nestle his head into his back and a min later he is unfurled..I am very sad and upset to see him like this...i tried to prop t-shirt into slight round hole so that if he goes inside and sits when he keels forward he his head will be propped up but he would climb into the rim i created...now he is so far gone he just won't attempt to go up onto the rim anymore he just sits outside. So I don't bother making that round hole and rim...I've had to clean his anal area of poop as he sits around on his body and i when i get home from work...please advise...what to do or should i put him down. I just watched him flutter all over the cage onto his back for what seems like forever...experiences with this pls advise. Will he pull through or should I end his suffering by having vet put him down?