I Feel Like Everything I Eat Gets Stuck In My

I feel like everything I eat gets stuck in my throat, even medications go down very slowly. I can also feel mucus accumulating in the back of my throat which forms "scabs" that I cough up once or twice a week. My throat does not hurt, I do not have fever or a cough. I do have acid reflux for which I take omeprazole twice a day. What could be causing this?