I have always had anxiety but hear lately it feels like my heart is fluttering I went to my doctor and she wants me to get a stress test done so now I'm really scared is it anxiety or something with my heat

You will have to wait to find out after the stress test results. If it was easy to diagnose over the Internet, your doctor could diagnose you without doing the stress test. With that said, anxiety can mimic some heart issues. The only way to know for certain is to have that test done.