Male non-smoker, non-drinker.  36yrs old.If I move too fast or do something strenuous my heart beats out of my chest, I have to fight for breath, my head gets fuzzy, and my hands tingle.  Also, once in a while during the day the symptoms will happen even if Im not doing anything. This come on in the last week or so. Since this started my balance has been a bit off, my thoughts not QUITE as clear, and my feet have felt colder.  Caffeine makes my symptoms worse, and the symptoms are worst first thing in the morning as soon as I get up.
Thanks for your question on Chat Doctor. I can understand your concern. In my opinion, we should first rule out heart diseases like arrhythmia (rhythm disturbances in heart) for your symptoms. Arrhythmia like supra ventricular tachycardia (SVT), atrial fibrillation, atrial flutter etc. can cause similar kind of symptoms. So consult cardiologist and get done 1. ECG 2. 2d echo 3. Holder monitoring (24 hours continuous recording of ECG) You may need anti arrhythmia Chat Doctor.  Don't worry, you will be alright. First diagnose yourself and then start appropriate treatment. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.