Random Muscle Twitches -- Anxiety Related?

Hello, I'm 18 years old and every day for about 6 months now I have had these random muscle twitches that occur anywhere on my body (some days I get them less than others) and occur at any time of day.  The twitches are VERY random and usually occur directly after I think of something (this is very hard to describe I just know that I get the twitch in response to my thinking).  When the twitch occurs, it will happen any from my leg twitching to my head/neck/arm... pretty much anywhere.  Also, when I am under the influence of marijuana the amount of twitching I get can increase tenfold (although it is all primarily in my legs).  

I am really concerned about this, I am not epileptic and neither is anyone in my family. I have never had a seizure in my life.  Recently I have been really concerned I might have brain cancer or something because I also get these really weird headaches/lightning bolt headaches in the back of my head all the time for as long as I can remember.  I am generally a very worried, insecure, and paranoid person (I am always worried about what others think of me) -- could this be the reason why I am getting the twitches? If you need any more information please ask and thank you very much for your time

[lost_myself]

First you gotta stop the sherm  ...i know its hard believe but it can make stress symptoms worse.Check on here peolple will tell ya ..alcohol too. don't know why seems like it would help but nope. Good Luck

[state24]

It is anxiety related. I get the same exact thing. Pot makes it way worse for me so so quit as soon as you can. The thing that helps me is to take a small amount of an anti-anxiety drug called Lorazepam. Talk to a psychiatrist about it man. Let me know if you haven any questions

[jannae]

wow the same happens to me very offten, in the same order. Whatever happened in your situation? did you start taking meds or just stop smoking, both?
i just would like ta know what i should do?