unsure if uriticaria???

Hi, Im 17M and i've been dealing with this for a while, but im not sure if its uriticaria or not. I've visited pyshciatrists, neurologists, derms but no one seems to know. It started 5-6 years ago and hasn't stopped since. The sensation itself is like being poked by thousands of tiny needles all over my body including my hands, arms, back, and scalp and it's a very painful sensation. I notice it happens most when I rapidly gain/lose temperature or feel very anxious/scared suddenly. Recently, I've started running every day and without fail for the first 5-10 minutes, I feel the sensation before it begging to wear off. I'm unsure if its uriticaria though because I have never seen any hives/physical symptoms.