Vinigar symptoms and conditions

I am a 50yr old female... was prescribed Lisinopril 10mg for bp.. after a few weeks I started getting a funny hard to explain feeling with my heart beating a certain way.. don't know how to explain it.. fluttering maybe.. feel it pounding. So after I realized it could be this pill I stopped it.. I moved out of state from my dr... and not ins. yet.. however I watch my bp and when it got alittle higher I thought I will take 1/2 one.. which takes BP down to normal, but after doing this here and there.. that same feeling in my heart started..
Has anyone experienced this feeling?? I don't seem to have the other side effects Thank God.. but this one scares me as I don't see anyone mentioning this feeilng..