Don't feel healthy 😔

I feel awful. 
Last month in July, on the 9th, I had protected sex with my boyfriend with a condom, he didn't ejaculate and there were no holes we checked with water. It was also outside of my fertile window. The only thing I did during my fertile window was give him a handjob and blowjob which obviously can't get me pregnant right?
I got my period when expected, on July 17th, it was a little lighter than usual, and more painful. I had terrible headaches, cramps, backaches, I was bloated and nauseous and just felt all around awful. I was scared of pregnancy so I took a test after that period which lasted six days with red blood and it was negative.
Around the time I ovulated after that last period I felt terrible too. My abdomen was tender and everything hurt. I didn't have sex during the next cycle. My period came this month too, and it's about the same as last month. I took a test before this period just to be sure I wasn't pregnant because I STILL continued to worry about pregnancy from last month, and it was negative. I went to the OB-GYN because I couldn't take the pain anymore and she prescribed me birth control that I'm going to start taking tonight. She couldn't prescribe me it without taking a urine test to make sure I wasn't pregnant. I didn't even pee much for the test but apparently it was enough. 
I'm on my period now and I feel so nauseous and sick and I'm STILL worried about pregnancy. Should I let it go? I'm just wondering what's wrong with me and why I'm feeling so bad.
Thanks everyone