What Causes Severe Itching Along With Pins And Needles All Over The Body?

i have severe itching and a feeling of needles poking me when ever i am hot, stressed, and working out at the gym, i am a combat veteran who was prescribe by the VA doctor a cream that is to intensive for me to take, the name of the medication is Betamethasone Dipropioate .05% cream. The affects when i use this product adding to the problem, i need your expert advice on another solution, please.