So sorry to hear that, my son was diagnosed at 7 years old, not severe, needed blood tests, but not bad enough for steriods, but his health, engergy levels and general immunity where affected, he also got arthritus as well. It was two years till he full regained the energy levels he had before, the bruising went away afte a couple of months, the arthritus got quite bad. I was a little shocke as we just got discharged and told to get on with it, there was nothing really they could do unless it got worse.
Did your child just have a MMR or other vaccine as it is a side effect of vaccines.
We had to have weekly urine and blood pressure checks, my sons diagnosis was changed to Henoch Schonlien pupura, a vairent of ITP.
I allowed my son just to sleep and rest when he wanted, my son was home-schooled so he could, he would have never have coped with school, he was way to tired. Did not complain of headaches, but you have to just sort of let them get on with it, but it used to break my heart when he would get new bleeds.
on the positvie side, the younger they get it the better, the prognosis for a full recovery. hoping for the best for your DC.