I started developing severe muscle cramps in my hands, feet and calf muscles about a year ago. It has been joined by shaking muscles either when I'm holding something, just holding my hand out or when I'm doing nothing at all. The shaking can be anywhere on my body. It is joined by uncontrollable muscle spasms that are not severe but are irritating. This can occur anywhere from my eye twitching to my legs and feet. I've been taking klonopin for nearly 30 years. I do not drink or take drugs except tazanadine to sleep. Are these symptoms of something serious?