I understand your frustration with heat hives. What medicines have you used? Zrytec proved to work 100% side-effect free for me.
Try this website's online prescription plan or schedule an appointment with one of their urticaria specialist at Urticaria.Com
I havn't had the money to try their medicines but I have read that cholinergic urticaria can be cured.
I know zrytec and other meds just cover up the symptoms which means that the allergy will always be present but just temporarily eradicated. That is why the website above has special medicines that attacks it differently and should completely eradicate heat hives from the immunal level.
Partly the reason why I havn't tried their meds is because I only have to take loradine or zyrtec (and I have some very very bad hives) every 2 days and i'm absolutely hives free. If for any reason the meds were no longer affective I would think about a cure.