I'm An 84 Year Old Male Who Is Recently Having

I'm an 84 year old male who is recently having shaking spells. They last only a very short time (under 30 seconds) and they happen maybe 2 or 3 times each day. I just saw my family doctor and had a very complete blood screening, which came back showing everything is normal. My concern is that I've fallen once because of this shaking onset which happens without any warning. Usually I've been able to hold on to whatever is close enough.