Part of die-off for me is when my bladder is full I feel a tingling in my leg and foot. This is because the nerves are connected. ever since starting l-glutamine this is what's been happening and I attribute it to die-off. That fine hair is probably yeast. Keep an eye on your stool so you can undoubtedly confirm that it's die-off.
You mentioned your gut was feeling better. That is a great sign and all the more reason to expect to see some yeast in your stool.