It is unlikely that you need a heart catheterization and if the stress test is negative the pain is not likely coming from your heart and you should talk to your doctor about other causes of the chest pain.
Hi,
Speaking from experience, you must keep going back to your G.P and if possible your Cordio, if the pain gets too bad get urself to the A&E.
I say this because unless you keep doing this, they don't get an accurate picture of how things really are.
While ur sat at home putting up with the pain, they don't know unless you tell them!
It took me a while to realise this & although you might feel inconvenient going back or calling all the time, they do get things done much quicker!!
Good luck, I hope they get you sorted soon.
Kind Regards
Tara