Pressure in my head

I've been acting strangely over the last year at work and at home. My mother noticed my behaviour change and so did my colleagues. I started getting pain in my head and kept getting contant styes in my eyes. I thought it was just an allergic reaction to my new kitten, but now the left side of my face around my eye is puffed out like I've been stung. I can feel something wrong in my brain. I've felt it for weeks and it hasn't gone away. Pain in my left ear. The doctor phoned me and said I need an MRI scan to see what is causing the pressure in my head. It happened before the setraline. I think I have a blockage in my sinus that needs draining. It's pushing against my brain. I can't think straght or concentrate. It's hard to get an appointmnt with my doctor. He wanted to see me last Friday, but he was fully booked, so I have to see him this Friday instead. I need my sick med certificate back dated from last Friday and more setraline. I'll also need to book a MRI to see what is happening in my head

I think there is some kind of cyst in my head pushing on my brain. I feel it the second I wake. It wakes me up. I may have to go to the ER.