Body is doing weird and gross things. HELP!

Since my last period, about 2 weeks ago. Iv had excessive discharge that has gone through my underwear and pants!! I've been cramping randomly, or after i eat (which makes me feel sick), or after sex. The pain has been so bad i ended up in tears a few times. I've been having horrible headaches every day and hot flashes that make me feel like im going to pass out. I went to the doctor 4-5 days after my period and they said they do not know whats wrong with me. All these pains have continued and i need some answers why!!