Welcome @hihihihi, That's an awful feeling when a persons is unable to clear their throat and nothing seems to work. It sounds like you may have Laryngopharyngeal Reflux (LPR). You might find the following discussion helpful where other members have shared their experience and possible solutions that help.

-- Laryngopharyngeal reflux (LPR): https://connect.mayoclinic.org/discussion/self-diagnosed-laryngopharangeal-reflux/

Have you discussed your symptoms with your doctor or seen an ENT specialist?

Very sorry to hear about your problem. While you work on getting to see a doctor or an ENT specialist, I would drink a lot of water to dilute the mucus and try to rest with pillows support to keep your head up. Not knowing if you have an allergic reaction or not, that's the best I can say. I also have a lot of mucus in my throat & the procedure is still 8 days away. Wish there was an easier way out, best wishes though

I would also do gorggles with salty water. Works better than tea for me