oh, i'm going through the same thing. depression/anxiety triggered by relationship. of course i already had depression, but it was inhand, now the bf situation made it worse. as men do, lol. look at every thing that is causing anxiety and making you depressed whether you feel it shoul dbe or not. face those issues. i would be very sad and depressed if my bf moved across the country. that's gonna be tough and i'd be worried that our relationship won't survive etc. i'd have all sortys of worries running through my head, so you're not alone feeling that. it's perfectly normal. but if you feel it's more than you can cope or is normal for you in thses situations then definately go see a doctor.
big hugs.