Re: Brain tumour anxiety, could this just all be due to sinuses?
There's a good way to check if it is your sinuses. Gently press a couple of fingers onto one of the places where your head is hurting (classic is the cheekbones under and to the side of the eyes). If it temporarily relieves the pain, it is very likely to be sinus pain. I've certainly experienced this kind of pain with sinusitis, so it certainly *could* be - however I'm not a doctor!
It is possible you have something which needs antibiotics, and in any case it is always a good idea to get stuff checked out when it is making you so anxious. I really doubt it is anything serious, but it's bery likely something which can be put right pretty easily. You won't know if you don't ask...
Let us know how it went!
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All manner of thing shall be well... (Julian of Norwich)