@stevenson I hope this will help you. I have suffered from this for many years. I do not get actual hives...just the pins ands needles like your husband. When it comes up - could also be a stressful moment...or walking and getting very warm suddenly...or doing the last 3 reps on a weight machine. For me it really only comes up in the winter.

Because it was so uncomfortable I rarely battled through it because it was so uncomfortable. It would almost come up sometimes in a rush and be gone.

I FINALLY got relief by SWEATING in a steam room. The dry heat in the sauna was way too painful. I joined a local Gold's Gym for a week. Day one worked out...it came up...went to the steam room for 15 minutes. That was the most I have sweated in a long time. I took a long shower as cold as I could stand it.
Day two went too play pickle ball for 90 minutes AND it did NOT come up. Next day on the treadmill for 30 minutes at 4.0 and worked out. NEVER came up. I worked out 4 times with 4 12-15 steams and really sweated with the cold shower. It has not come back. It has been 8 days. I am going back to Planet Fitness - (no steam room) to see what happens. I hope that helps you and anyone else. For me it is a miracle.