You need to know what is causing the tremors. If you have parkinson's they may have to adjust your meds upward to compensate for the Riba but you need to know what is causing the tremors. See a neurologist.
mb
glad you figured it out but in future.
a double dose is very yukky. My advice would be when in doubt, take a half dose.
that way is you did forget, you are still getting some, but if you did take it and forget, at least you'll only get enough more to drive you slightly crazy and not stark raving mad.
mb