Ugh (venting)

My Dr suggested that I take my pills back to back to try to avoid my period or at least make my symptoms more bearable (she thinks I have endometriosis). She also took me off of low dose birth control and put me on Minastrin. My period is supposed to start in the next day or so and oh my god I feel sick to my stomach. My back is killing me and I'm not sure I'll be able to keep my dinner down. I'm sure it's the increase in my birth control but I really hope it won't last my whole cycle!