Hi. I am 20 years old and in the air force. I recently completed basic training about 2 weeks ago and about a month or so ago when I was still in basic, I was having chest pains and pain in different parts of my body. They all began when I woke up one night with extreme pain in my left arm. About a day after that, I had a sever case of diarrhea but it was very strange in color and consistency. For about 2 or 3 weeks after that I was having pain like I said in my chest and arms and for some reason my knees as well. I went to the hospital several times and had x-rays and ekgs done and all was normal. So now when I arrived at my first base, about a week in my right thigh started twitching involuntarily for about an hour or so and from there all the other muscles in my body did too...Including my eyelids and the muscles in my nose and face. Over the past 3 days, I have been losing my appetite severely, feeling weak and not being able to sleep. Along with those symptoms, I hear my heart beating very hard whenever I lay down and I get strange feelings under my skin like as if a drop of cool water lands on your skin and runs down...Except its under my skin. Also, when I cover my ears or lay down with my ear on the pillow I hear a sound like a rattling or a car engine running. Finally, I feel occassional vibrations under my skin, usually in my legs, that last for a few seconds and I recently started feeling them on my toes. Any ideas if this is stress related or if I could be suffering from something else?