What is wrong with me? Please help!

So around the 23rd of last month, the day after I was supposed to start my period, I started to feel icky. Nausea (mostly at night and early morning, occasionally throughout the day), diarrhea, back ache, migraine, mild cramping, hungry but no desire to eat, overly tired, irritable, etc. I just chalked it up to my period coming. Considering it was already late I just figured it was an off month and didn't think too much of it. The 26nd came around and I finally got my period and I started feeling better until about the 3rd day into my period. It wasn't a normal one for me though, The first and 2nd day it was lightish, the 3rd day it was semi heavy then the 4th day it was barely there, my monthlys are never like that. Fast forward to now and I'm still feeling crummy, all the same symptoms, except now my face is breaking out something fierce and I've gained 10 lbs witch is EXTREMELY out of the ordinary for me. I've NEVER been able to gain weight, literally ever, except for when i was pregnant with my kids. At first I thought maybe I had caught a bug or something but with it going on as long as it has I'm almost certain that isn't the case. I do have a drs appt scheduled for next week but until then I wanted to see if anyone else has experienced anything like this? What was wrong? Any insight would he helpful.