Hello @stevenson, I would like to welcome you to Mayo Clinic Connect along with @albiet, @martinsmckinney, and other members. I ran across an article about paresthesia and hives and was wondering if it might be helpful related to your symptoms.

What Causes Pins and Needles -- https://physioworks.com.au/FAQRetrieve.aspx?ID=30988
Paresthesia Information Page -- https://www.ninds.nih.gov/Disorders/All-Disorders/Paresthesia-Information-Page

5 Causes of Hives You Wouldn't Expect -- https://www.health.com/condition/allergy/hives-causes
Mayo Clinic Q and A: Chronic Hives Come and Go With No Clear Pattern
-- https://newsnetwork.mayoclinic.org/discussion/mayo-clinic-q-and-a-chronic-hives-come-and-go-with-no-clear-pattern/
What to Do When Stress Gives You Hives -- https://www.stress.org/what-to-do-when-stress-gives-you-hives

Do the symptoms go away if you stop exercising for a period of time like a few days or even a week?