Birth Control Pill

I recently changed from Nexplanon to low dose BC pills. Since I’ve been taking t it’s made me feel constantly sick. I get nauseous, when I’m really hungry and try to eat I can’t get myself to eat the food. I get severe cramps randomly. Like to the point where it hurts to walk and it brings tears to my eyes. My stomach has been all messed up. I haven’t had any crazy stuff with emotions and I’m thankful but this body stuff is kicking my ass. Has anyone ever felt something similar? How long did it las?