I imagine your doctor will recommend either shots or oral drops for the allergy if it is severe enough. I've never met one that would recommend a homeopathic method, probably because you do not have as much control over the dosage as you would with lab mixed shots or drops.
They should do a test to see what all you are allergic to and then will give you the appropriate allergens in increasing doses to help your body start creating the necessary stuff to combat them in the future. There is a pin prick test which is supposedly not very accurate, and then another test where you receive 48 allergen injections in each arm that is more accurate. I have had the shot one twice not and it is not bad at all due to the tiny needles.
I have been on allergy shots for a while now and have noticed a difference. The shots are supposed to work for about 80% of people, which is not bad odds. When I did my test, I was allergic to literally every single thing on the list except one, some with fairly severe allergies. Needless to say, I am usually a congested mess in the spring unless I take Zyrtec D twice a day. The shots have helped lessen the severity and will hopefully eventually get rid of the symptoms.
I would love to do the oral drops, but they are not FDA approved, so no American health insurance companies will cover them. They are big in Europe, according to my ENT doctor. If you don't like needles, the drops might be worth the ~$60/month.