Abnormal movements of a particular body part can be do to tremor, muscles twitches, or abnormal postures secondary to dystonia. You state that these movements occur usually with action, and therefore they may represent an action tremor. Stress and stimulants, such as caffeine, can exacerbate these conditions. Irritated muscles can sometimes cause intermittent twitches, so if you have been doing more typing then usual that also may be a possibility. Lastly activities which are repetitive could cause a dystonia. This is a disorder in which a person wants to do a particular motion, but incorrect muscles get activated by mistake. I think discussing this with your primary doctor is a good start, and then consultation with a neurologist can be performed as needed. Good luck
Oromandibular Dystonia. Abnormal movements involving jaw and tongue which severely affect my speech and eating. I took Seroxat 5 years ago for 12 months and have been taking infrequent doses of Zopiclone for 2 years.
I also take Tamoxifen for breast cancer and Thyroxine for underactive thyroid. Are any of these medications responsible for the Dystonia?