I'm not a doctor but I think you should continue to see one. Seems there is something else or more (possibly not serious) going on, could just be a sinus infection or that cyst ( I don't know much about the sinuses) and something to do with medications you are on, etc. No idea. Sounds all accross the board. Try to see someone who will help you through the symptoms. You could go to a neurologist to rule out that it is due to concussion/PCS.