Thanks for using the forum. I am happy to address your questions, and my answer will be based on the information you provided here. Please make sure you recognize that this forum is for educational purposes only, and it does not substitute for a formal office visit with a doctor.
Without the ability to examine and obtain a history, I can not tell you what the exact cause of the symptoms is. However I will try to provide you with some useful information.
I am sorry to hear about your loss. Twitches in the majority of cases are benign meaning they have no consequence and do not cause serious damage or are resulting from serious damage. The twitches can occur focally (one location) or generalized (many locations). Twitches can be related to anxiety/stress, caffeine, and often occur post exercise or muscular over-use. Another type of twitching, which is normal, is called a hypnic jerk. It occurs as we are falling asleep. Again it is exacerbated by stress or caffeine. For these symptoms, the best treatment is to reduce the caffeine intake and/or reduce the stress. If the twitches are bothersome or disabling, medical treatment may be necessary. This will need to be at the discretion of your physician.
I would recommend that you cut back your caffeine (sodas, coffee, tea, power/energy drinks, etc) and get adequate sleep. If possible, you will also need to reduce your stress. If the twitches continue and are bothersome, you may need to see your PCP for further management and workup. If additional symptoms occur, such as hard time swallowing, talking, or breathing, you will need to be seen asap, but these are in rare cases and are associated with other disorders, which does not sound like based on your description.
Thank you for this opportunity to answer your questions, I hope you find the information I have provided useful, good luck.