<s>[INST] Hi I’m a 56 yr old female with no thyroid on synthroid & Hugh blood pressure meds. Been told I have a slightly enlarged heart & mildly leaky valves. Driving home a half hour ago I felt squeezing in my chest. No pain but it took my. Breath for a second then I started shaking. Hubby checked my sugar level when I got home & it was 81. Should I be concerned about my heart or anything? [/INST] Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. I passed carefully through your question and would explain that we can not exclude a possible cardiac issue related to your symptoms. Other possible causes to consider would be anxiety, an electrolyte imbalance, etc. Coming to this point, I recommend consulting with your attending physician for a physical exam and some tests: - a resting ECG and cardiac enzymes - an exercise cardiac stress test - a chest X ray study - complete blood count for anemia - blood electrolytes for any possible imbalances. Hope I have answered your query. Let me know if I can assist you further. </s>