As hard as it is going to be I suggest that you give the two of you a little more space and take a well needed emotional break from all these feelings.... then before you to go off to different medical school I would recommended that you fix the friendship and enjoy what life has given you with this very special mam - so there are no regrets down the road.

BTW - I have been in a similar situation where my gay gentleman friend was in love with me and as hard as it was on him we still remained friends (after a separation period) for some twenty years.... may he R.I.P.