Nausea and migrains for 2wks? Advise please?

I went on birth control on may 15th (orthotricyclne lo), this was also the start of my period. The next day i started to experiance nausea and headaches. This progressed to the point of migraines and literally being sick to my stomach just about the entire day (the only thing i can eat or drink that will not make me feel sick is ginger ale and soup), i spoke to my doctor and they advised take it at night, i tried that and it didn't get better so i quit taking the pill 4 days ago. Well here it is 4 days no pill and i started my period 2 weeks earlier than i should, and i am still very sick to my stomach and keep having constant headaches that progress into migraines. I feel so drained, and getting light headed. What could be the cause of this? I thought it was the pills, but shouldn't they be out of my system by now? I'm getting a bit frustrated and just don't know what to do. I don't know if this warrents a trip to the e.r. or a clinic cause i don't have a primary care physician, and im not sure this is in my obgn's realm.