My heart is beating so much weaker than it use to, It feels like blood is backing up in my left arm, wtf? I get really light headed, and confused. It feels like there is no oxygen getting to my brain . My heart has been skipping beats frequently and my blood pressure drops occasionally. And it s gotten worse over the last 2 months. If I go into the hospital and tell them my symptoms, will they test my heart and thyroid out? Do you think it s serious enough for an emergency room visit?