I'm really sorry for all that you are going through.
Unfortunately I don't have much advice except for get into your doctor as soon as possible. I understand what it's like to have your body go nuts, especially what it's like to be in a new relationship and deal with such chaos.
I met my boyfriend in June, and in July/August, I bled for 5 weeks. Not only that, but my skin started breaking out. Once that was under control, I discovered I had a big ole cyst on my right ovary. After 2 1/2 weeks of BCPs, I had horrible pelvic pain and started bleeding (while still taking BCPs!). Knock on wood, these bleeds seem to be under control (thanks Yaz!). Now if I could just get the hair to stop falling out of my head at such a rapid rate, I'd be ok!!! Lol.
I try to exercise away my stress when my body goes nuts. This has helped me to keep my weight in check. Also, I try to keep an eye on what I'm eating, especially carbs. At least diet and exercise are two things I can control. You're up six pounds from where you were, and if you try your best to control that right now, you won't go up more. I gained a total of 10 pounds throughout my craziness, and I'm finally back to where I was before it all began.
Don't give up. I know it's rough, but hang in there. It's ok to be upset, afraid, etc., but use that energy positively. Keep doing your part with diet and exercise, call your doctor, and start meds and/or supplements to get your body under control.