What to do if i am having severe heart palpitations- but hospital can't find anything wrong?

Palpitations: You need to discuss this with your doctor. Depending on what workup you've had, you could have many things going on. If you've had the appropriate cardiac workup and nothing is documented, you may have anxiety or else are calling something palpitations that is not a heart palpitation. People use words that may be understood differently by other people.