Although this is a long-shot, the cause of your hives might be autoimmune. Tylenol suppresses pro-inflammatory COX enzymes, which might be involved in autoimmune hives. The other medications you are on are all anti-allergy and should have suppressed your hives, unless you are allergic to something that you are getting exposed to a lot of....
Gluten & Sulfite Sensitivity, Multiple Food & Inhalant Allergies, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD (Lupus?), Osteoporosis, Anemia, malabsorption/malnutrition, etc.
Meds: Pulmicort, Claritin, Injectable Vitamin B12, Herbs, Nutritional Supplements, Essential Oils, Homeopathy.