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If the treatment you did didn't work for two weeks, then likely that's not it. Usually those will show SOME sort of change - if and only if the base diet is also sufficiently fortified if it were nutritional. If it's neurological, those things take time. Then I'd stop the B supplement and continue with the E as he's still got either something skeletal/muscular or neurological and it hasn't been determined which yet. If nerves were damaged they don't repair - however nerve paths will develop to try to rebuild function. That takes time and exercise. If you feel up to it, since he's strentching his neck and seems to be a favorite boy, I'd give him very very gentle therapy. Look at how he sometimes stretches his neck, and do that with him very very gently a couple of times a day - then stop. Do it daily. Using the area encourage nerve paths to increase their 'efforts' (bad choice of words) to repair the area.
On weight, if you haven't fed a high protein growing type food (or whatever is age appropriate for him) that is a crumble/pellet and completely fortified (at least 95% of his diet) I would do so immediately. Continue the E. Continue vitamins/minerals in his feed or water. Give yogurt just once weekly. If he doesn't have grit, offer him some as textbooks state that abird being given proper grit will do better with weight gain as their food is more broken down (which is why you want to continue the yogurt weekly). I'd go for protein, personally. I find my birds will be in better weight condition with a good high protein feed.
If this condition can correct, it will take a lot of time since it's been a lot of time.
Have you considered something like Nutridrench? It has vitamins/minerals and a higher level of vitamin B which increases appetite. Since he wasn't on a completely fortified feed before, it's possible the B was just increasing to normal levels - not therapeutic levels. Nutridrench and just vitamin E added might make the whole process easier for you.