Help! I'm Experiencing Constant Swelling on the Left Side of My Face

My sinuses on my left side have been constantly swelling and each time it terrifies me in going to the doctor or ER, everything always reads fine. Yet i have this slow progressing building pressure on the left side of the throat, sinus, ear, and face that just keeps happening. Gas builds up and gets stuck in that area making it even. more painful. Its been like this since my deviated septum surgery. I dont kbow if I should see a ENT, Gastro, Heart or Neuro anymore because noone can seem to tell me it's anything else but allergies. Please guide me.