The only problem is that it has to be injected and most people can treat their hay fever with medication that doesn't require injections. It may have some benefit in people who have asthma complicated by their rhinitis. Until it is approved, we really won't know how it fits into treatment of allergy and asthma. The standard treatment for nasal allergies includes nasal washes, antihistamines and steroid nasal sprays. Yes, both antihistamines and nasal steroids can be used, depending on the clinical symptoms and the response to treatment.
Many patients use both.
I have always had normal rhinitis symptoms but this year I have also developed asthma and food allergies. I am very sensitive to various fabrics - cotton seems to be the only thing I can tolerate. I am currently taking Flovent 220 mg, Serevent, Flonase, Singulair, Maxair, and over the counter Benadryl. I cannot tolerate Claritin, Allegra, Zyrtec or Astelin, they make me extremely hoarse. Many people with allergic rhinitis and spring time allergies develop significant symptoms such as itchy skin, as you are experiencing.