Homeopathy works on the principle of like cures like, by example, teary eys and a runny nose can come from allergies, but you may get the same symptoms from peeling onions. Taking Onion in a it's homeopathic form may reduce your symptoms. However, there are many hundreds of homeopathic remedies, to get a good result you would need to see a Homeopath who will do some specifc homeopathic case taking, as some other symptoms you mat have will result in a different remedy, which may be more suited to you ..
sometime oyu are lucky to get relieve from an over the counter homeopathic remedy, which is usually a combination of the most likely remedies in one complex. You probably can buy a hayfever complex. Anyhow, visiting a homeopath may cure the problem for good, while the other options are more symptomatic.

Try getting some local honey and eating a little bit of it everyday. About a tablespoon a day… It won't work immediately like allergy meds, but after a few days you should notice a difference. It will help to build up your immunity to the allergens in your area.