Lucky you... at least you both want to get married, no matter how many obstacles there are.
My man has refused to get married under any circumstances which, essentially, rules out any chance of a life togther. He refuses to be dictated to by authorities, governments, civil servants, not to mention his own loathing for the 'institution' of marriage.
I don't want to be married to someone who doesn't want to be married to me (been there, done that, bought the commemorative tea towel) so I have to face the fact that our being together long-term is not really on the cards, if we're being realistic (after nearly five years 'together').
He also has serious health problems, which means every time we see each other could be the last. Leaving him behind is utter hell. I spent a week with him in December after he'd suffered a second heart attack. After spending time with him in hospital, we stayed together for a few days as he convalesced. I had to leave, knowing that in his condition he could possibly have another heart attack at any time, or a complication could occur, and there wasn't a thing I could do about it.
I'd already taken emergency leave to fly out and am not in a position to drop everything again at such short notice. (Not to mention the grilling I received from customs and immigration at JFK, when I entered the US one month after my last visit. I told them I was here as my boyfriend was in intensive care. 'Is your boyfriend British?' 'No, he's an American citizen.' etc.)
Painful as it is, be thankful that you're both pulling in the same direction. I'm sure things will work out for you, in the long run. I envy you.