Hmmm, I used to feel really touchy and paranoid for a week before. Constipation, feeling heavy.
Then on the first day of my period I'd have not too bad stomach cramps and the runs.
The day after, my period was much lighter and I'd feel great again. Day three and four, I barely had any period.
I guess I got off lightly compared to a lot of women? I think it was really my mood that suffered most of all.
Now, I've no idea. Night sweats, weird dreams, constipation and the runs (but not every time), cramps, feeling like I'm going to pass out (but not every time), feeling low in myself. But nothing much seems to follow a regular pattern. Sometimes it's bad, sometimes it's barely noticeable.