As for the anxiety related symptoms, I have been getting treatment for this as well
If you don't take any medications how is your anxiety being treated? Untreated anxiety can manifest in physical symptoms and will remain a problem unless the anxiety is controlled. Much of your symptom list would not be caused by a disease such as Multiple Sclerosis.
A positive ANA is really not specific and especially in the case of MS. Some with MS have a positive ANA and some don't. I have never had a positive ANA.
I do wish you all the best.