I too have been having the same problem for two years now ,every morning it’s the same mucus just lying in my throat ,sometime it forms so hard and crusty it’s hard to hack up!Iv been to the doctor too may times and I’m now only getting my ent appointment, the doctor Kept saying it’s possible reflux but medication didn’t help ,also had multiple nasal sprays ,antibiotics,antihistamines ,it always lodges it’s self on side of my throat ,also the side my throat always feels very irrated it seems the pain comes kinda Above one tonsil that no doctor seems to understand why ,it’s so frustrating and now causing problems with my eating as it feeling like my food always getting stuck with my mucus