Make the title of your post specific to your issue. I pick and choose which post to read based on the title. Ambiguous titles such as "need help" "what do you think" and "my situation" give me no insight as to your specific issue and have a greater chance of being passed over as I pick which...
If it is an autoimmune based arthritis, it should most likely be rated under VASRD DC 5009 which refers to the rating criteria in DC 5002. If it is autoimmune, you need to make sure that is clearly documented in your MEB. Have you been seen by a rheumatologist?
Be aware of 10 USC 1222a. It requires PEB to address your concerns and questions in an orderly and itemized fashion. In your appeal, list your questions and concerns and specifically cite 10 USC 1222a requesting these questions and concerns be addressed. Your first question should be why they...
The BCMR application deadline is three years from the date the error or injustice was identified to you. The BCMR usually makes this timeline indefinite in the interest of justice. Have you ever filed with the VA for this condition? If so, what was the result?
What was the unfitting condition? Was this condition subsequently rated by the VA? If so, what did the VA rate unfitting condition? What is the effective date of this rating as compared to your separation date?
The Navy should not be denying reenlist based on a condition found to be fit but if you do not desire to stay in that issue might be moot. Your next likely step could be with the Board for the Correction of Naval Records.