I get random palpitations in my heart before I go to sleep and notice them in my throat. Does anyone know what this is? Is it harmless?

Hey everyone out there, I need your help! I have tonsillitis/pharyngitis again, and now I see something red above my tonsil. I'm in a lot of pain, but it's not because of the red stuff, because I had the same pain the last time I had tonsillitis, without that red stuff. What could it be?…