My fatigue is getting terrible. i can sleep non stop up to 20 hours a day and still feel tired. is this connected to ms? i have had optic neuritis.

Yes with MS: you might experience extreme fatigue. Of course other conditions can do this (chronic infection)

Analysis: With history of optic neuritis, if you were shown to have one or more MRI lesions at the time, you have at least an 80% chance of eventual proven MS. Worth getting updated MRI studies and seeing a neurologist. You may need appropriate interventions.