Painful achy legs & feet, sometimes arms. no swelling. occasional numbness. gastro problems. fatigue. increased anxiety. dizzy. could i have ms?

Possible.: But given all the symptoms ms is unlikely. Specifically pain in the arms and feet, gastro problems and increased anxiety do not really fit the typical ms.

Sounds like 2dary: Secondary symptoms occur with MS, but are not the key factors in MS. Try this tool to help see if you may have MS http://www.neurocuro.com/how-do-you-know-if-you-have-ms/