I am 37 years old and I am usually healthy. It has been ten days already since I've started feeling like I have something in my throat. I got really worried especially after reading about throat cancer on the Internet and I quited smoking since. Two weeks before that feeling, I went to see a new dentist who checked my mouth (after reading that throat cancer can be spotted at a dentist where white/red marks can appear in the mouth) and he did not mentioned anything unusual.
Could you please tell me what can it be..

Many thanks