Oh god what a scarey time, I've just found this thread, and when reading your ds syptoms the first thing I thought of was HSP, My son had this when he was 4 and infact I had replied on someones thread months ago whom thier dd had syptoms but it turned out not to be HSP. My son had HSP very bad, its starts at tops of the limbs and the rash/purple bruises raises itself until it looks a bit scaley and dies down again but my ds's rash covered his full body attacking his joints which became very sore and swollen, he has regular urine and blood pressure checks to check his kidney is functioning properly as in extreme cases as ds had, it can attack the kidneys up to a year after having HSP.