I Take Levothyroxine And Tamoxifen (had Breast Cancer Last Year).

I take levothyroxine and tamoxifen (had breast cancer last year). Now I have been prescribed aspirin, plavix, lipotor, and toprol--nitro as needed--all because of a visit to ER with mild pain in let arm and sweating and slight chest pressure. Am white female 68, 108lbs., 5 ft.
EKG came out normal, heart enzymes in blood slightly elevated and angiogram showed no major blockages. Seems like a lot of meds...wondering if they'll interact.