I also found that if I eat sugar in any way I will have a build up of mucus within the hour. So you may want to try staying away from sugar for a day or two and you will breathe easier.

You can buy it over the counter. I buy walgreen mucus relief it is cheaper. I sometimes get croaky voice. I do my breathing exercises and eventually the mucus clears takes a little work some days and some days it is good. Drinking water helps

JohnAlt, you can buy mucinex over the counter. I get the sixhundred mg and take twice a day. I get mine at Amazon comes right to the door.

A spoonful of honey also helps with sore throat and cough Raw honey works best

The croaky voice could be an inhaler, if one of them contains an inhaled steroid. Those are the usual culprits. You can buy mucinex over the counter; no prescription required.