Need some help with my pms please...it's horrible

Hello,
I really need to know i am not alone with this...almost every month before the period and first few days when it starts i feel terrible. Some months it's not so bad actually, but others it is a nightmare. Right now i feel bad cramps, as the period is due at any moment, i feel lightneaded, really all over the place, i have been feeling this horrible bloatedness for the past couple of days, it is sooo bad, from just under the ribs all the way down, with so much gas, and it gets so uncomfortable at times that i even feel i can't breathe freely, i am slightly constipated, i go but it's difficult and small, and i feel so depressed and anxious about feeling these things...
Please, anyone out there going through this sometimes?? Particularly i am interested in bloatedness.
Thank you.

Millie