Off birth control

I've been off birth control pills (alysena 21)now for almost 2 months haven't gotten a period all pregnancy tests are negative and so are my ovulation tests. I have constant cramps in my lower back and in my stomach, I'm nauseous, sore boobs, extremely tired and I'm breaking out bad all over my body chest,stomach, legs. You name the spot and there they are. I dont know what to do its driving me crazy