hi i had gone through your query and understand your concerns. i would come up with the possibility of ALLERGY is the underlying cause for your sufferings of both SINUSITIS and HIVES ( URTICARIA ) possible causes; -genetic predisposition;family history of similar complaints may confirm it. -digestive inefficiencies -drugs -food and food additives -candida infection --physical factors like heat,cold,sun,exertion,pressure, -insect bites -intestinal worms are some possible causes treatment option; i would suggest you taking Homeopathic medicines gives safe and permanent cure for your allergic complaints consult your local homeopathic physician for correct diagnosis of the case and remedy to fit your complaints I hope this is helpful for you, thank you