I need advice pertaining to my upcoming mission and my relationship.

I’m starting MTC a week from tomorrow and I’m stressing man - real bad. I’m leaving behind the most incredible girl I’ve ever known, we’ve been dating for about 18 months. She’s the only person in the world I can depend on. I live with parents who can at times be considered emotionally abusive, they yell at me constantly - often even dragging my girlfriend into the argument. She’s the only one who I can be completely honest with - I have no doubt in my mind that she’s the girl I’m supposed to marry.

I’ve been having frequent panic attacks at the thought of loosing her. I’ve been struggling to sleep because I know I’ll be one day closer to saying goodbye.

Does anyone have any words of advice? How can me and my girlfriend overcome this difficult time?