With a normal catheterization your chest pain is unlikely to be due to CAD.
I am assuming that your echo is also normal and that you don't have other structural heart disease. Your doctor, I am sure, would have ruled this out. If that's the case, your chest pain is not cardiac in origin and may be due to other conditions. Often times, this is related to musculoskeletal causes. Asthma and acid reflux should also be ruled out.
This is exactly what my GP had said would be looked into after the heart cath. I realized that this all started (chest pains) around the time I was perscribed Mobic for plantar fascitis. Found out side effect of this RX is chest pain. Have stopped drug. Visited my GP today who shows me a copy of my heart cath. It says I have a LED Sep (Ostial) Calcified Discret 70% lesion. The cardiologist told me all was well. Is this a minor defect or should I be concerned? Thank you. Cheryl Lukuch