Talk to Psychiatry on Pins & Needles

I am suffering from this condition where I feel like pins and needles in various parts of my body, then I start to scratch and red bumps appears. This usually happens when I am in a stressful situation or when my mind is tired (evening time), or after a long and thoughtful conversation with someone. I also feel pain the back of my head going down to the back of my neck. During this condition, my mind becomes blank and have trouble breathing normally. Pins & needles usually occur in scrotum area, lower back and feet. If condition is sever, it moves to my upper body. This condition goes away after I take antihistamine but comes back after few days. I was diagnosed with disc bulging in my neck 8 years ago. What could be the probable cause of this condition?a pinched never in neck? anxiety resulting in allergic reaction in my body? or some problem in my head area? Which specialist I should I go to? Thank you