Tremors in hands. Medicine or anxiety?

I have been diagnosed with OCD and Anxiety disorder 7 years ago. I took fluvoxamine 200 mg and clonazepam 0.25 mg(SOS) for 4 years and left, then the problem relapsed and since last year october i am on fluvoxamine 200 mg and clonazepam 0.25 for 15 days in Last October then SOS since then. I need a dose of clonazepam once a week because of panic attacks. My compulsive actions are still there and i can't get over them. I have started feeling derealized or detached from world not emotionally but it feels i m a robot and i am just doing things but nothing feels alive. I feel all this is unreal and i start Having a panic Attack and think that i m about to die and get breathless and sweat a lot. I take clonazepam then. But since 2-3 days i see my hands have tremors sometimes. Not often. My mri and vit b12, vit d and thyroid are normal in recent tests. Is it because of medicine or anxiety? It happens more when i am tired of workout.