this is a common side effect of anxiety. i can't explain it, but i do know that it can be "managed", or improved, by learning skills such as focusing on the breath, slowing it down gradually; counting with the breath, 1001, 1002, 1003,, for as long as you need to; delaying actions and decisions at least 15 minutes to let the kidneys clean out the bloodstream of stress chemicals; distracting yourself from the stressful thoughts by reading, reciting, meditating, etc.; and deferring important activities until you have more control. remember to keep your blood sugars up by having a snack or fruit juice or something when you are stressed, and right afterwards.

i know this is not always easy in real life, so it's good to practice these skills while you are not feeling at your worst, but rather when you are feeling only slightly stressed. i hope you find the concept of skillful means to be helpful to you,,, best wishes,, Gus