Have you had your Vitamin D levels checked?? I have had similiar feelings the twitches, anxiety, general unwellness...and my vitamin D levels have been terriably low for 2 years. I am working on bringing that level up. I finally figured out why I couldn't get it up into the normal level and that is because two of my hormone levels were low. Because those have been low I could NOT absorb the D. It has been SO frustrated figuring this whole big puzzle out. But I am on my way.
I would seriously check out your vitamin D levels and your hormones. All of these are so very important and if they are off you can feel TERRIABLE! I even went and had all the tests run on me at a neurologist because I was afraid I had MS or ALS. She diagnosed me with Benign Muscle Fasiculations. I still have the muscle twitching on and off. It drives me nuts!! I have it today too. Just remember you can get that from caffeine and Sudefed. Alot of allergy meds cause this.
Good luck! You will be fine!