Pressure on forehead

I have been having head pressure on the forehead, behind both of my ears and back of my head (by the neck) for two months. I have also noticed that I get a pulsating pain by my right temple. These symptoms occur while I am driving or walking and occasionally while I am sitting down. Also I get nausea after I eat and I am having more frequent burping throughout the day. I taken an MRI one month after these symptoms surfaced which came back negative for tumors. I been to a neurologist and he said that I have tension headaches. Now I have developed another symptoms: constant ringing in the right ear. Is it possible that tension headaches can also cause ringing in the ear? Is it possible that I got my MRI too early and tumor was too small to be detected and now since it has grown I am developing more symptoms?