Welcome to the forum. It is great to have you as a member. This is a wonderful place to get advice and support from people going through similar situations. The members here are very helpful. It is nice to know we are not alone. I, too, have experienced much pain and muscle tension from anxiety. Sometimes it has gotten so mad that it has made me feel flu like and sick to my stomach. Nothing has ever been found wrong and it alwayc happens at times of high anxiety. The symptoms are very real and painful, and I know how hard it can be to accept that they are just anxiety.
Feel free to explore the forum. There are lots of useful topics to read. Feel free to post and ask questions. If you have specific concerns or questions start a topic in the appropriate section to get the best feedback. There is also a chat room for members 18 years and older that you can access once you have made three meaningful posts in the forum.
Again welcome to our community.