I harmed myself, again.

I did a yoga course a while ago. The instructor told us that deep breathing provides more oxygen and can heal injuries faster. Complete nonsense. It can lead to hyperventilation which is not good for the cells.

Wikipedia cleared me up to late. I did the excercise for about 20 minutes. I feel a pressure feeling since 3h in my head, predominately in the injured area.

Do I have to fear another damage now?