What's happening?

I'm so sick you guys. I have diarrhea, I have constipation, im eating a LOT, like a freaking cow, but after I eat, I feel like I am starving about 15-20 mins later like I just can't get enough, I am having extreme hot flashes, & im peeing like crazy. Btw, I'm PMS'ing & my period is due in 8 days but I have NEVER have symptoms like this. Could this mean that I could possibly be pregnant? Not now obviously because I'm PMSing but next week, when my period is due. Like has anyone ever experienced similar like symptoms before a BFP?