Do I have CU or is it really just something else ?

I ve been having this condition for about a month or longer , at first I ignored it thinking it s just a random itch After a week it really limited my life , I normally walk distances to get my needs and groceries . I used to be in the Gym for 3 months , sadly I stopped after that and my body is no longer fit as it used to , at that period I NEVER had any sign on CU on my body In this time whenever I walk outside for a while in a sunny day I break into a severe itch that is just too annoying to ignore , it won t stop until I relax and stay in the shade (it stops almost immediately) I don t get it , I never had this before When I was young I had a very mild asthma that didn t require medications it seems that I have grown out of it and it no longer exists for even then I wasn t itching . I will be checking it out at a doctor , but the thought of This illness makes me really anxious I can t sleep due to it , however whenever it occurs I don t see red hives as the online sources describe it I never itch if I'm in bed with several covers and heavy clothes , never itch if I m standing outside in the hot sun even for hours , it s only when I walk or exercise especially underneath the sun , whenever it happens too I never seem to sweat .. I really hope it s not something incurable , I had a goal of joining the army since I was a kid , I hope this isn t the end of it . Note : Taking Allergy Medications stops it for the whole day regardless on how hard I walk or exercise .