Hello and thankyou for approaching DoctorSpring with your query.
I have gone through your case and understand your query.
What you are experiencing seems to be drug induced lupus. The drugs you are taking belong to the anti TNF group of drugs which are used to treating psoriatic arthritis. They are known to cause drug induced lupus and demyelinationg disease of the CNS and lack of vitamins make it even worse.
I would advise you to do the following tests
1) ANA by immunoflorescence
2) Serum Vit D3 and Vit B12 levels
Depending on these tests results further decisions can be taken in your treatment plan.
I hope this has helped.
Please feel free to follow up with further queries.