These include caffeine, pseudoephedrine (Sudafed), amphetamines, and the asthma bronchodilators
albuterol/
salbutamol (e.g. Proventil, Combivent, Ventolin).” In your case probably caffeine is the culprit alonf with stress.
Refer: http://en.wikipedia.org/wiki/Fasciculation
Once you cut down your caffeine and build up your lost iron by taking iron tablets and iron rich diet, you’ll be ok. Here is a link for you to go through for a complete list of iron rich food. http://www.loveyourbaby.