If you have had Optic Neuritis (ON), then your MRI will have to show evidence. While a general neurologist might dismiss you, an MS Specialist should not.
You have RA and are taking meds. The MS Specialist will have to look at your RA and meds in dismissing your symptoms which may be caused by these.
ON on its own can be a separate disease. ON can also develop into MS and be part of MS.
You are not a lunatic and please do not allow any person or doctor to dismiss you in such a manner. Your symptoms are real and need to be evaluated. The MS Specialist will evaluate you following the Revised McDonald Criteria.
Please stay strong. You are not alone and we will be here while you journey through limbo land.