Well after the trauma of trying to get the antibiotics down him a few days ago and only managing a few mouthfuls today he came out in a rash. So after a 3rd trip to the docs this week he is now highly likely to be allergic to penicillin (just like I am) and definitely wont be given it ever again. So I was right not to carry on giving them and to ignore the first docs advice, thankfully.
He is a little better in himself and the doc today said he didnt want to give him anymore med as he would get better himself:)