Any idea on what's going on with me (doctors is pretty far from me)?

Anonymous
The doctors is pretty far from where I live so I don't want to waste my time if its not that serious.
I'm 20 and the last time I was sexual was a good two and a half months ago. So I don't really think I'm pregnant and we used protection. I also took two sticks and they said negative. That was like three weeks after we had sex. I knew the guy and we were in a long term relationship and I was his first everything. I'm fit, I workout and I'm up on my feet all day since I deal with kids.
So I've been experiencing excessive gas (burping a lot it hurts), weight gain, breasts are fluctuating (sometimes they fit exactly, way too much or a bit smaller), nonstop hunger or cravings, thirsty all the time, side pains both right and left side sometimes with a migraine, my hearing and smell is more sensitive than usual if that matters and I'm very tired lately. I usually can hold up a whole day and feel fine now I have to catch my breath and stop midway through the morning and afternoon.
Any ideas? I really don't want to drive far ):
Any idea on what's going on with me (doctors is pretty far from me)?
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