They both take Zyrtec and have taken a cocktail of different antihistamines over time (Atarax,
Allegra,
benadryl, etc) and steroids . They say the hives are pressure-related so you should avoid any tight fitting clothing (especially with elastics - nylons, bras, etc)and massages. Heat seems to make them worse too. One of them claims to have achieved remission when she started taking baby aspirin, but no one can explain why that would help.