Very late period? Stomach pains?

I took birth control for a year and a half and stopped a year ago now due to the horrible symptoms I could stand no more i.e. cramping, bloating, weight gain, migraines, nausea and even nightmares and moodiness.

My husband and I do not and have not used protection since then as we don't really mind anymore if I end up pregnant. Not trying definitely but what happens.. happens. 

I had normal-ish periods in that they were about a month and a half apart as they were sometimes even before I took the birth control. But I've had many problems since then still with the nightmares and stomach pains.

Now on Feb. 2 (2012 obviously haha) was the last time I got a period. Going on 4 months in a week. I've had worse stomach pains and this morning I had such bad ones that would flare and die down and flare up again and it finally subsided after taking a nap. Now some stomach pains are sharp when I sit or lean over and are random but I have another type of more spread out pain in my entire abdomen when i'm hungry or full at times but also random as well. I have had on and off nausea but it's been like that since and after taking the BC. I have no noticeably sore breasts. I have been a bit moody and tired but that's also on and off.

Bathroom wise, since my last period i've had a thick clear discharge constantly as well as peeing a lot and most every time I have a bowel movement when I pee as well. 

The one thing is, I've taken several tests all spread out, the last one being 3 weeks ago and they all have been negative. And yes..I followed the instructions clearly. Anyone have any advice or experiences? :(