After a stressful day trying to arrange medication for my cat's megacolon to be mailed to me I'm having mild pain around my heart as it beats when I bend over. It stops hurting after I straighten. I've dumped the cup of mildly brewed green and white tea and switched to hibiscus tea, which I read helps settle the blood pressure, and I took an extra half of my Isosorbide ER. I have been without my Levothyroxine for several days while trying to arrange for all meds to be mailed to me, and more is on its way. Deep breathing also seems to help the pain a bit. What is this?