I'll first say that I've just recently (within the past week) had a blood test to check my thyroid levels and they are 'normal'.
However a few weeks ago I noticed a slight lump on one side of my neck and after an ultrasound scan found that I have a 2.5 cm complex nodule on one lobe of my thyroid (it's now being monitored). In the past few weeks I have noticed more of an 'action tremor' in my hands, noticeable when holding objects, etc. It varies in intensity - nothing terrible, just slightly annoying and a bit worrying. No tremors at all when my hands are at rest or aren't doing much.
Now I know that this could be caused by a great many things, from stress and anxiety to something in (or not in) my diet. Perhaps even just the aging process. It could also be because I live a sedentary lifestyle with no exercise at all so my muscles could just be 'weak' and the tremors issue is exacerbated by my age. I'm not overweight and eat carefully.
I also feel tired a lot of the time and am easily worn out (have been this way for a great many years, I always put it down to the IBS which I have suffered from for over 15 years).
I'm 'only' in my early 50s.