Hi and welcome,
Sorry i don't know what it could be, doesn't really sound like MS and i'm not sure stress alone would be an answer either, but if you've not been sleeping over the last 6 weeks, that would definitely affect cognitive and balance hmmm have you considered things like medications, vitamin deficientcy etc?
Sorry to not be of much help.......JJ
Muscle twitches and spasms and anxiety can be symptoms of low magnesium, which may be a symptom of Lyme Disease.
See this list at the Canadian Lyme Disease Foundation:
http://canlyme.com/lyme-basics/symptoms/
"Red lines on my body"...do you mean like stretch marks?
Compare them to these photos of Bartonella striations:
http://www.personalconsult.com/articles/activestriations.html
I hope this will help.
Carol