Hello, Thanks for choosing health care magic for posting your query. I have gone through your question in detail and I can understand what you are going through. Its certain that you are not tolerating the pre workout supplement. This would be a reversible phenomenon and the things should be fine after some hours. You may take paracetamol tablets as of now if the pain is unbearable. From next time try avoiding such supplements. Hope I am able to answer your concerns. If you have any further query, I would be glad to help you. In future if you wish to contact me directly, or want to any further details about the asked query, you can use the below mentioned link: bit.ly/dr-srikanth-reddy Wish you good health, Kind regards Dr. Srikanth Reddy M.D.