Throat Problems. I have to swallow away.

I've been having throat problems for the past 3 weeks. I have the feeling of hard to move snot or something at the back of my throat. Just above my airways, and I can only get bits of it to move over time with constant swallowing. I can feel it constantly edging towards my airways and I have to swallow to make sure it doesn't cause me to choke. When I eat it seems to produce more of this substance and it's a constant irritant that's made my throat raw and sensitive and also made my gag reflex super sensitive. So I can't cough at all really because it triggers me to gag. So I feel constantly tortured with the irritant which all I can do is swallow and not really fix or help it. It has caused me to be scared of eating as it causes me anxiety over it as the feeling of trying to hold back constant gagging is a very unpleasant experience. I do suffer from a lot of heart burn. But Ive had that for years. I also feel saliva constantly on the edge of my airways that I have to swallow away.