Whilst I can't give you a definitive answer, it may be partly that 'normal hair loss' is being resumed as your hair recovers? If you look at any reputable trichology (sp?)website you will discover that 'average' hair loss is in the region of 50 - 120 hairs a day. I noticed about a month ago that I was starting to shed a few hairs and was mildly perturbed until I started counting... oh, about 10-20, so maybe normal? Also I've noticed that even a year on some hair is only now starting to grow back, especially around the 'widows peaks' which can be a bit itchy/tingle at times too.
Is your experience at all similar? Hopefully it will not turn out to be thinning/loss.