Yes I get this all the time. Like you, I've been through the ringer with the doctors and checking my heart and all. Everything is normal and healthy. I get the chest pain if I get stressed, these last couple of days it's been because I get so overwhelmed with homework and school. I am a college student so working full time and going to school full time is really taking a toll on me. My chest pain feels more like someone is pinching my heart. It can be very uncomfortable. To help alleviate it, I find deep breathing helps a lot. Most times after I do this, the pain goes away entirely. Remember also to try to not to let it bother you. Anxiety and its symptoms are like a badly behaved child, the more you give into it, the worse it gets. Try to ignore it and not let it bother you.
Here's a deep breathing exercise that really helps me:
Imagine your lungs have three levels: bottom, middle, top. Start by taking three breaths: inhaling filling the first level, inhaling filling the second, and inhaling filling the top. (Your lungs should be entirely filled with air by now) Hold your breath for 5-7 seconds. Now release your air using the same method in reverse. Breathe out let out the air from top, breathe out letting it go from middle and out again releasing all air from bottom level. Do this up to ten times. This should really help and make you feel much better after you're done. Let me know how it goes for you!