<s>[INST] Hello, I am a 22 year old female and have been having palpitations/arrythmias for the past 4 years, not frequently. however, in the past 4 months i had a terrible palpitation that made me feel extremely faint. then a week ago i had left arm tingles/pain near my hand and a minute or so following that i had a heart palpitation... then a fast heart beat for about 12 hours and felt fine. then 4 days later i had another episode and have had a fast irregular heart beat, high bp for me 140/80 just relaxing and tingling, numbness sensations in my hands and feet that come and go for the past 5 days. I have been stressed with biochem research and a new hostessing job, fathers aortic occlusion surgery, and my boyfriends depression (thats bounced back to normal)..... however i did take plan B about 2 weeks ago and had a light period after 2 days of taking it which was blackish in color. i have a cardiologist appt in 2 weeks and a gp appt in a couple days. i went to the ER because my symptoms were lasting too long. the ekg and bloodwork were all normal. [/INST] Hi, This can be arrhythmia like PSV or atrial fibrillation, where your heart rate suddenly goes up and BP falls. As you mentioned heart rate was irregular, then there is more likely a possibility of atrial fibrillation. You will need evaluation like ECG, thyroid test and holder monitoring. You should also get one hemoglobin levels done. So visit a nearby cardiologist for this investigation. Also, to abort such episodes you should try to cough hard. Till the time your evaluation is complete, you can ask your local doctor for tablet Collar. Hope I have answered your query. Let me know if I can assist you further. Sagar Made </s>