Hey Matt! youve lived with this all your life i guess you know something about you then huh! Ok i've lived with this for awhile & found the following to help me clear the congestion, you need to hydrate better, as a rule we need for every 20-25kg of body weight(40-50 pounds)1 litre of water per day. The other thing is we also need minerals in our bodies for the correct function of our organs & for our thyroid to make the hormones & triggers that allow our bodies to function correctly, the thyroid is actively engaged in over 300 different functions,these minerals can be obtained generally through the use of unprocessed natural salts like sea salt or himalayan salt.The cells of our body are each suspended in fluid that has the saltiness of sea water(which explains why hospitals pump extra saline into us). The salt will help get rid of the congestion you will have to learn how to use it & if you reply via a private message i can help you with this. Also research "the 22 fundamentals of salt in the body" Another site you should visit for good education on the importance of mineral balance is: ithyroid.com , water cures is another.
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Do you have other symptoms like asthma allergies?
this post applies to all, if i can be of assistance to any, you are welcome!