jon, the diffuseness and persistence of the symptoms is strongly suggestive of anxiety, and if your tests come back negative its almost a certainty. The combination of therapy and some medication is the ideal way to deal with this, but if you feel you are getting some insights in the first few sessions, you might hold off on the medication, it may not be necessary.
Yes, possible and probable. In fact, highly probable.
Things to try are meditation, exercise, listening to upbeat music, staying out of bed in the daytime, keeping busy (esp doing things for other people, eating regularly and stopping researching symptoms. Trust your doctor and be honest with them.
Heat packs, baths etc. might help you in as you seem to be expressing your inner feelings through your muscles.
Be kind to yourself. It will get better.
Hi, It is amazing, I had very similiar symptoms as you have. I had a extreamly stressful incident about a year ago. I started to have physical symptoms as a result. My symptoms were muscle twitches all over my body, muscle tension and muscle aches and pain. Also it felt as if my extremeties were numb with warm and cool sensation. I still have it to a degree, my doctor prescribed wellbutrin which helped about 60% and he finally gave me some klonopin which helps somewhat, it usually just makes me tired.