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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
You likely have rheumatoid arthritis given that you have positive RA factor also besides ANA titer.
Your symptoms are also consistent.
The fogginess and shakiness are due to prednisone side effect.
They should subside in 2 weeks.
However you will need to consider different medication to treat rheumatoid arthritis like Methotrexate which has less side effects compared to prednisone. Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/