I have tightness in my chest, very hard to breath, my heart skips beats, sometimes I have pain in my chest, back and under my left arm. I am taken a water pill for my bp which had gotten to 190 over110. Sometimes I feel as a lump is in my throat, I have had 2 bad spells like this and afterwards I feel tired, tightness in my chest, cant get enough air, tired I just want to sit down and sleep. What is this and why do I feel this way. The last 2 months I felt great until the other night when this happened again about 10:00 pm