Slight headache from yesterday

I am suffering from AVH(acute viral hepatitis) , I went to the doctor and they admitted me my livers ultrasound is perfect but my lft reports were not good so they diagnosed me Gilbert's syndrome at that moment till my ultrasound was perfect I was thinking it to be liver cancer but it's not now when I am home I am a little constipated I watched a film late night when I went to sleep I had a slight headache on left side of head.now today when I woke up I searched for pain in left side of head it have me Brain tumour in result the pain started again. Is it Brain tumour ????

I noticed that the vein passing through the head is swollen so it's temporal artertis

If you have any, and I mean ANY problems with your vision, get medical help at once, even if you have to go to an emergency department.  Temporal arteritis or GCA is treated as a medical emergency as serious as a heart attack or stroke, because you can lose your eyesight.  Better a false alarm than going blind.  

If your eyesight is all right, but the symptoms continue, please see your doctor as soon as you can.

I am asking is it brain cancer

You do know that you are only talking to other patients here, don't you?  We aren't doctors.  You can get ideas from us but no real medical advice and certainly not a diagnosis.