Anxiety Support Group
Anxiety is a physical condition marked by intense and persistent feelings of distress, fear, angst or dread. General anxiety caused by routine day-to-day stresses usually passes quickly and is experienced by almost everyone at one time or another. However, such feelings that linger over time and are very difficult to cope with, and which lack a clear cause, may indicate...

Sitting and pondering in front of computer is not moving the body..., and once you move the body, you'll find the sensations you mention being applied to movement, and it will help you feel less overwhelmed.
Best wishes.