Nausea and vomiting from Stress and Anxiety

I feel like I’m the only one that deals with this. Since I started hearing allegations of my husband’s affair, I’ve been nauseous and needing to take medication to ease it. Now that I know he has been with another woman since April, it’s gotten worse and I can’t eat a lot. My Dr thinks I’m crazy and need to come see her, but my husband screwed my insurance up and I can’t go, unless I want to pay an outrageous bill. (My husband and I are separated currently). I go to therapy and my therapist gets it, but she can’t prescribe anything because she’s not an M.D. I feel so screwed and angry. Has anyone else dealt with this anxiety/stress nausea? And what are some ways I can help it?