There's this girl dating, everything is going well but everytime we have a date I get really nauseous. I've cancelled 3 times so far and she is mad as fuck. I think it's because of anxiety or something medical but I've already been to the doctor and they said everything is fine. I'm really pissed off at myself because now all our momentum is gone. I really like this girl, maybe it's that...

Is there anyone else with this problem? And how do I fix it?