So lost

I finished my period on January 7th. I started spotting on January 14th. It's now a full blown period type bleed. I have horrible cramps and they're making me nauseous. This is not the first time something like this has happened. Last time the doctor couldn't find an answer. I have no idea what's going on with my body. I'm frustrated, confused, discouraged, and in pain. Advice, words of encouragement, anything. Please.