I've Been To My Gynecologist Numerous Times And She Said

I've been to my gynecologist numerous times and she said I have a severe case of endometriosis. As a result she put me on birth control however it made me sick . So she tried different ones but they all had the same result . Finally she put me on the depo shot , and at first it was alright but now I've been getting migraines , nauseous and everything . And when I go to work at ups and do my job I start bleeding randomly when I strain my body . Idk what to do at this point