I'm sorry you guys are having trouble....Only because I'm older I'll offer any advise
IF you guys are arguing this much BEFORE you get married - then it's bound to escalate more if you actually make it legal - I hope things work out for you ....but to tell you the truth - this may be a blessing in disguise.
I know you'll get LOTS of helpful replies here - but I just wanted to add my 2 cents and tell you ...Keep your chin up -
sometimes a big CHANGE in our life is the scariest thing to face - but in the long run ...can be the best thing for us - we just don't know it when we go thru it ...