First of all, keep us posted on the biopsy results.
I recently had a very dark mole, about 2mm x 4mm, which seemed to appear overnight, on my thigh. I had a major freak-out, too. According to the biopsy, it was severely atypical. It was re-excised after the biopsy. So, now I'm constantly doing my own mole checks out of compulsion. Melanoma is probably now my biggest health anxiety issue, and I hate it.
What I wouldn't do to go back to the days of worrying about MS, ALS, and Parkinson's! Now my thumb and index finger twitch like crazy and it doesn't even phase me! I could now care less, if I got MS, unless I got that and worried about melanoma, too.