Hello im 17 yrs old and I have chronic sinusitus. But this feeling dont seem to be from sinusitus (as I never had it before) for the past 4 days my head has been feeling like it has pressure and gonna explode it dont hurt and there is no pain at all its just a weird pressure feeling and it only goes away for like 15 mins but then comes back today tho my nose started running and my eyes are sore and my nose hurts and I still have this weird pressure feeling. Im worryed it may be something worse like a brian tumor or something and that my nose and stuff is running after 4 days just becuz I got sick somehow but why would my head be feeling pressure 4 days before I get sick?. Im gonna go to doc monday but I just wanna make sure now it aint possibly somethingg serius

thanks