Please advise. Unrelated to arthritis.

Two years ago, my mother (47) was diagnosed with arthritis, which is now under control with ongoing treatment. Her arthritis medications include Methotrexate 20 mg weekly, Folic acid 5 mg twice weekly, Hydroxychloroquine 200 mg OD, Vitamin D3 60k monthly, Calcium and Vitamin D tablet OD, Paracetamol 650 mg SOS, Tramadol 37.5 mg SOS. Three months ago, she developed a tingling sensation throughout her body and head tremors. A neurosurgeon conducted a CECT brain scan, which was normal but indicated nerve weakness. She was treated for three months, but symptoms returned after stopping medication. She now experiences head tremors, tingling, restlessness, and rapid blood flow sensations. She was on medications for this:- Brivaracetam 50 mg, Duloxetine 20 mg, Tetrabenazine 25 mg, Trihexyphenidyl 2 mg, Coenzyme Q10 with supplements, and Rabeprazole with Levosulpride. and The rheumatologist confirmed these symptoms are unrelated to arthritis.