Getting so frustrated!

Since March my AF has been all messed up and I had to go on Provera three times to get it to come. Last month was the first time I got it on my own. It was suppose to come this month between the 11-18 those days came and went with AF no where in sight! I tested three times only to get a BFN! Now last night I started spotting and got really bad stomach pains when I laid down for bed. I felt like I was going to get sick. Now this morning I have no spotting! I'm getting so frustrated with my body all I wasn't to do is cry.