awww don't! its really a good idea to trust your instincts, and it sounds like the doctor probably doesn't think that he has an infection, it's hard to get fluids into poorly babies (you could try watered down juice, milk, ebm or dioralyte) also propping his cot up at one end so his head is slightly raised might help.....the best thing you can do is lots of cuddles and take care of yourself/make sure you are eating drinking loads to keep up with him as he is probably bf'ing your boobs off!!!