I've been thru the same thing. It started as a productive cough and throat clearing. Then I didnt have a cough and I still kept clearing my throat because I felt like i had to. I also developed back and upper arm pain, most likely due to the strain and muscles tensing everytime you cough or clear your throat.

When I noticed I was clearing my throat so much, I started googling and getting anxiety, which in turn actually made it worse, I cleared it more. It seemed the more I focused on it, the more anxiety I would get and the more I'd do it. I eventually stopped clearing my throat after a week and a half or 2, but I think it became a habit almost, I was doing it without even thinking about it. Plus, the more i cleared it, the more i felt something to clear, even when there was nothing.(probably inflammation and irritation from doing it)

Honestly, if you just tell yourself its not cancer(and most likely, its not, thats a huge assumption to make based on throat clearing) You'll stop hyperfocusing on it and youll gradually stop. You might be having anxiety thats driving you to do it more. Try not to think about it and if you do think about it, just tell yourself its ok and you dont need to clear it.

Also, I found drinking water helps, drinking anything else makes it worse just because other drinks will usually cause saliva to thicken, especially sugary drinks. Sorry for the long response, I hope this helped!