Lily,
I'd think I needed to replace my doctor if he told me it's anxiety when I had the type of muscle problems you are telling us about. I did replace one doctor who told us it was all in my head. Later, I went to Mayo Clinic in Rochester, Minn and now have evidence in writing that it is a small fiber sensory neuropathy caused by Sjogren's Syndrome. That is an autoimmune disease.
I'd be getting me another doctor so that you can get a referral to a neuro, ..if it was me.
Billye