Ulnar nerve.
Go to a sports med doc, or a hand therapist. (it may require a visit to the doc first to get a referral, depending on insurance.) If someone walked into the clinic where I work, still numb 3 days later, we'd send 'em out. (to a doc)
Do not pass go, do not collect $200.
This is not normal.
And once everything is good again, get a bike fit by a physical therapist. You've got something to deal with which is most likely beyond the ken of your average bike shop fitter. PM me if you need help finding a PT who does bike fitting. Google should do it, and call around to sports PT's in your area and ask if they have a trainer to put your bike on for a fit. My clinic does 1 or 2 bike fits a week.
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson