I dont want to speak too early but he does seem to be slowly getting better.
He had his second and last injection of vitamin B yesterday.
He is now drinking 450ml of milk 3 times a day so a big improvement.
He is having 1 and a half tablespoon on plain yoghurt twice a day to reline his stomach.
He's stopped stretching all the time and starting to have a bit more energy again and showing a tiny bit of interest in the solids.
Now he's showing improvement i'll try some different feed and entice him to start eating corn.
So it looks like he could of had some coccidiosis or bactetial infection.
Thank you for all the help. Fingers crossed he will keep improving and be back to normal very soon.