I took him to a vet last night and he had a blocked urinary tract. They flushed him out and kept him overnight.. They said he is doing well and I can get him this afternoon

 

When you mentioned that you only give him biscuits I thought of urinary tract infection. I was told by a vet years ago biscuits can cause that in males. Even if biscuits are cheaper please give your cat meat and fish most of the time. If he becomes unwell again I advise you to never give him biscuits again. Of course it's best to obtain a vet's opinion but that's the safest thing to do. Every so often I give my cats biscuits and my males are young but if there's a problem there will be no more biscuits. I hope your boy will improve quickly.