vaginapagina | nervous about sex

I have been dating my boyfriend almost a year now, and we both enjoy having sex with each other but within the last 4 months or so I have become very paranoid about getting pregnant. Because of this I haven't been enjoying sex as much, and don't want to at all sometimes just because I am so afraid of getting pregnant.

We use condoms every time and he's very careful with using them, but I still can't seem to shake the thought in the back of my mind. I spoke with my doctor and because of some past health problems in my family she said I shouldn't be on hormonal birth control.

Also, I normally weigh about 115-120 and anytime my weight fluctuates or I think something has changed about my body, I automatically think I'm pregnant and start to freak out. Lately I've been feeling kind of sick, and I freak myself out even more then.

I'm just wondering if anyone has any pointers on how I can keep my mind off this and start enjoying sex again. Or if anyone has had similar experiences and what you do about it?