Panic and anxiety are stand alone problems which can manifest as MS like symptoms, but panic and anxiety would not cause the ovoid plaque. Panic and anxiety can also be found with MSers too.
You were lucky that the cold turkey stoppage of Neurontin did not cause an adverse reaction. If you have a neurologist read your MRI, they might have a differing opinion with your images. A rheumatologist also would have a differing interpretation if fibro was the case for you.
As to uninsured medical care, I would contact your state agency which works with people in your situation to find out what is available in Kentucky. Many state teaching hospitals have programs set up for people who lack insurance.
Though you are tired of meds, there are meds which can restore a sense of normalcy depending on your disease or disorder. I hope this is your case so that you can get back to your life.