I'm shedding or have I damaged my scalp/hair follicles?

this is 100 % impossible to know with certainty. if too many things are done at the same time, one can not determine a cause and effect relationship in any way. Statistically speaking, one would predict that the dermaroller is rather unlikely to be a cause here and minoxidil and finasteride being more likely. But this is only am estimate of statistical probability. Other causes also need to be considered ways include stress, infection in the last 6 months, blood tests results in last 6 months, weight loss, other supplements and hair products used. Be sure to see an expert to help clarify these issues.