Allergic rhinitis as you mention is an allergic condition. So we have to be clear in our minds what are the symptoms that we want to treat.
If you want to treat the blockage: you might need to see an ENT to clear physical blockage that is due to large nasal bones (inferior turbinate), slanted nasal bones (deviated nasal septum) or sinus blockages (persistent sinusitis). This might entail some procedures and the cost can vary, depending on what is done.
If we are talking about the running nose and sneezing: we have to use medications to treat. Oral medications are a good start, but after a while might not work as well. Nasal sprays are good, but after you stop for a while, the condition recurs. You can consider immunotherapy as it is the only cure to allergies. You can see a GP like us with special interest in allergies, an immunologist or ENT for that. That is a long drawn treatment for 4 years comprising of an oral medicine or spray daily.
There are other ways to control allergies, but mainly, reduce humidity and dust mites. Take care and hopefully you find a cure.
