Brief: A stress test must stress you Detailed: Hello Thank You for contacting HCM. Welcome to Health Care Magic. My name is Dr Muhammad Ahmad & i will look into your problem. I have gone through your query and would try to help you in the best possible way. IN common practice we do two type of chemical stress tests when for asthma that is methacholine test it slows down the heart and other is for heart.... i think you can t run or do exercise or for some other reason they tried to race your heart with a chemical this is called chemical stress testing... during which they take your ECG on monitor and paper and see if during fast heart beat there is any changes or not... It is a very common finding in chemical stress test that every thing in your body goes to chaos you heart pumps fast so you feel palpitation and you hand tremble and everything goes hay wire ...brain starts signalling that some chaos has occurred so you go in panic and tremble...its not that easy to brin things back to normal immediately until the chemical weans off or is detoxified by body.. so don t be this much worried every thing was normal and happens in exactly the same manner in all stress tests that s what the name says STRESS test Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. Wishing you good health