My Son is Growing Spots!! EEEKk

For breakfast this morning I made Kalen a bowl of Oatmeal with Milk (He hasn't been drinking milk out of a sippy cup so I figured this would be a good way for him to get it). After breakfast he starts to play and he immediately wants to crawl on the couch and sit with me, this is odd for the morning.  When I pull him up I notice he has red spots on his neck so I lift up his shirt and they are all over his stomach. I begin to think he is having an allergic reaction to either the Milk or the Oatmeal.  So I call the Pediatrician to talk to them about it.  Of course they want me to come in, but I have no car today, the hubby has it and I only have the Jeep.  So I was told to just watch Kalen and if the rash gets worse or he starts to swell call 911.
        I am now trying to get a hold of my hubby who is no where to be found at work.  I have called his desk and cell phone and now am trying to figure out what to do.  Finally I find his pager number (yes his work still has these), and I begin paging him.  While I am waiting for his call I am getting dressed preparing myself to have to call 911 and take an ambulance ride to the hospital.  He finally calls me back after an hour and half of trying to get a hold of him and he says he will come home so I can take Kalen to the Dr.  By the time Hubby gets home Kalen's rash is now on his face all over his nose and mouth and on his arms and legs. 
      So I head to the Dr, which of course I manage to make it just in time to find out everyone has left for lunch.  So now I am stuck strolling around Target, which is extremely dangerous.  I also have a cranky son who has not napped yet with me.   Finally its 1 and the Dr's are all back from lunch.  We see the Dr and he said his rash is not consistent with a food allergy (Thank God)  He actually thinks Kalen was having a reaction to his set of 1 yr old shots (the reaction apparently can take up to 10 days to appear).  I was told to be on the lookout for a fever and a few other symptoms within the next couple of days.  If any of those symptoms appeared Kalen most likely has some other ailment and would need to be checked out again.
    My poor little mister, I have never been so worried.  I felt so bad for him he can't talk to tell me whats wrong and I wouldn't let him nap in case his airwaves closed up while he was napping.  On a side note I think he might also have an intolerance to Milk which is why he won't drink it and he may have also had a bad tummy ache to go along with his spots.