Hello... am glad you have reached out. Yes, the experience you share would be very disturbing and I am sure with the doctors telling you that it is anxiety is not going to make it go away. I would recommend you consult a psychologist. If you want you can connect with me online, I have worked with people who have had similar experience, by identifying what is it that is bothering you and triggering these experiences. Using approaches like emdr will not only alleviate the bodily discomfort, but also will help you to be more calmer.
In the meanwhile, you can read up on Rick Hansons work Just One Thing... these are very short excercises that will help you to be present...
Next Steps
orient yourself to the present
1. notice where you are sitting( if not sitting, then sit on a chair with feet touching the ground) and notice your feet touching the ground
2. name 5 objects that you see in your surrounding
3. name 4 colors that you see in your surrounding.. if there is blue, count how many objects have blue color on them
4. name 3 sounds that you hear in your surrounding like fan, lift, bird call etc...
5. name 2 smells that you can smell presently
6. slowly bring focus on your breath and notice the inhalation and exhalation.