So, I got on the phone to my doctor. Who (as usual) was off due to a holiday and won't be back until next week. I then phoned the replacement, who told me that I couldn't make an appointment with her, because that had to be done between 8am and 10am. When I was still asleep in bed, BECAUSE I AM ILL!!! Fortunately she saw reason after that (mind you, I didn't shout at her) and asked me what the problem was. Well, severe headaches for five days now and no sign it was getting any better. Flu-like symptoms like cold and hot shivers, lack of appetite and throwing up. She asked me a couple of questions and then told me that my medication would be waiting at the pharmacy that afternoon, because I had sinusitis!
So, I went to see my neighbour who was kind enough to give me a ride to the pharmacy and I picked up my prescription of antibiotics. I really hope this will work.