Ok. It very much depends on what type of allergies you have, but if you have mainly a running nose that it sore and excoriating with some eye redness and soreness, then ALIUM CEPA could help. This is the onion. If you have mainly sore, itchy and red eyes with nose symptoms too then EUPHRASIA could be very helpful. This is also known as eyebright. If you have hayfever that causes you to have excoriating discharges and sneezing that are better for warm and makes you feel very chilly and you are thirstly for small sips of cold water, then ARSENICUM is a good remedy for this. It is also very good if you have breathing and asthma type problems with your allergies and if you are betting sitting up and bending over. If you have hive type reactions where you get very itchy skin that comes up in hives and trouble breathing that makes you feel angy, then APIS is a very useful remedy in this situation.
So the possible helpful remedies are ALIUM CEPA, EUPHRASIA, APIS and ARSENICUM. You can get them in any healthfood store and you should get them in a 6 or 30x potency and take them three times daily until symptoms reduce. If they do not make any difference after about two days, then try a different remedy. Let the tablets dissolve under your tongue.
By going to see a homeopath and getting constitutional treatment, it is possible to prevent these allergies occuring in the first place. By all means try the remedies that I have suggested, but do go and see a homeopath and get some proper constitutional treatment that will remove your tendency to get these allergies in the first place.