We do all natural remedies at our house and we have lots of allergies.
For one, the best thing is to reduce the allergens in your home. What are you allergic to? We've had to get a HEPA vacuum and vacuum daily, we have dust mite covers on our mattresses and pillows and we have air cleaners in all the rooms. We have allergen reducing filters on our furnace.
The second thing, is replace your cleaners with all natural ones. Some household cleaners release toxins into the air. I use vinegar and water with a few drops of tea tree oil to clean almost everything.
For natural remedies for cold, flu and allergies I suggest a product with bromelain, quercetin and stinging nettle for allergies. I use NOW brand bromelain quercetin. Both help with histamine control and reduce inflammation. Also, up your intake of vitamin C. We take 1000 mg a day, and if someone around us has a cold we increase it to 3000 a day.
If you have a cold, I took zinc lozenges at the onset along with Emergen-C brand vitamin C packs. It cut the severity and duration of the cold.
Allergy testing is a must to see what you are allergic to. You might be surprised! Your body has an "allergen bucket" meaning if you're around one thing you're allergic to, your body can handle it. But overfill your "bucket" with allergens and your body will have a reaction. For example, if you're allergic to milk, having a little milk may not give you a reaction. But if you have a lot of milk, or a little milk and a banana (if you're allergic to bananas) then you'd have a reaction.
Get a neti pot if you have nasal allergies or issues.
Acupuncture can also help with allergies a lot!
I hope that helps, if you have any questions let me know. We deal with a lot of allergies and asthma here.