Super Bug?

Last week we were hit with some sort of super bug. They kept telling me M had H1N1 because of her high fever (104). However, she developed this rash that kept getting worse and worse and was unexplanable. On day 4 the Dr. said she possible had Fifth's (which on day 2 the Dr. said she absolutely did not have). At any rate, we believe she was having some sort of toxic reaction to one of the 3 perscription drugs (in addition to 2 OTC) they had her on. We have since come across Serum Sickness and think this may be our culprit since symptoms started on day 9 of Sulfa. Does anyone have experience with serum sickness? If so, what do you think? Good news is M is better now and is eating again and sassy as ever - just in time for Halloween. Here are some pics from day 2 of the illness. I would say day 3.5 was the worst...the rest of her body started to look like her face at that point.