perhaps pau d arco will help
make sure, if you are a vegetarian, that the capsules are not gelatin. i made that mistake once.
drinking a lot of water helps as well.
with all the mucus that develops with allergies, stay off the dairy if you partake of it, as this causes mucus to build up more and it is hard to get rid of it.
rubbing peppermint essential oil on your temples will help alleviate headaches accompanied by allergies.
jasmine tea or chammomile tea helps as well.
hot steamy showers as well.
also, try this...i have found it works...
fill a large pot up with water and bring to a boil.
throw in eucalyptus leaves, rose petals, spearmint and or peppermint leaves and a dash of patchouli essential oil and let all come back to boil for a few...then turn off fire or lower it to bare flame.
place a towel over your head and then surround the pot with your head and the towel and breath in and out slowly for as long as you can....repeat everytime steam overcomes you...try to do this for 15 minutes at a time throughout the day.
remember water consumption is essential to allergies and colds.
hope this helps