Could it just be you're older now, my acne didn't get better until I was in my forties. Sadly I've broken out again as result of hormone/steroid treatment

I think most psycho-active drugs have the potential to cause tremor. Neuro-transmitters work in every synapse in our body not just the ones in the brain, so it is possible that they can cause disruption anywhere. If you are worried get your doc to check you over.