Diagnosis?

Owen started burning up during the night Sunday night.  He ran a fever all day and into Tuesday.  Tuesday morning I noticed a rash up and down his legs.  I thought it was heat rash from the hot temperatures and his fever.  Tuesday evening he quit nursing.  He would root around like he was hungry, but as soon as I went to latch him on he would scream and turn his head. I was trying to think of something that I had eaten that would have made my milk bad, but was coming up with nothing.  He didn't nurse all night long, would sleep for about 20 mins and wake up crying.  I was still giving him tylenol/ibruprofen alternating.  By morning I decided maybe he was getting a tooth and oragelled him up really well.  After a few minutes the oragel worked and he nursed!  A lot!  So, I started thinking he must have a tooth about ready to pop through.  But then I noticed new little blisters and sores all over his fingers and toes.  His rash over his legs had gotten worse too.  I looked in his mouth, but didn't notice anything abnormal.  Now I'm thinking he has hand, foot, mouth.  It is a virus that often includes a fever, sores on the hands and feet, and in the mouth, which would explain why he didn't want to nurse.  If it is hand, foot, mouth, there is nothing I can do about it, so I am keeping his gums numb when it is time to nurse.  Any ideas?  Suggestions?