advice please?????

Need advice. Sometimes I don't want to have sex with my husband, he's forced to watch porn. I also sometimes lack at giving him oral, he gets mad but I don't budge. When we first got together I loved to have sex, I would even start it but now I'm just not feeling it as much. We've (pretty much ME) been trying to have a baby for about 6months ... no luck!! Made a doctors appointment and was put on Metformin 500mg twice a day & folic acid 1mg once a day. What's the reason I'm not into sex anymore, can I go see a doctor for my hormones or?? & is anyone else taken Metformin & Folic acid what was the outcome?