I myself started feeling a thumping sound in my right ear and the thumping varies as far as rythm, feels like I feel it more at bed time or when I’m trying to relax, it’s very annoying. It comes and goes I also had a sinus infection but this thumping started maybe about 6 months ago, the antibiotics helped with the sinus infection but not the thumping. Worried it can be a tumor.