Brain tumour scares. It can happens?

Yesterdsy night when I lied down to sleep I feels sudden heaviness n pressure at back of head and top of neck and also at top of head.. I got scared and got up.. pressure eased bit..I spent whole night in anxiety coz I read online that this happens when person have brain tumour or bleeding... but day before yesterday night I watched 2 hour movie on laptop Lying down n I had no problem.. even yesterday afternoon I has watched 3 back to back movies widout any heaviness and I felt happy n relaxed then how suddenly it can happens? I wear specs as my far vision is very weak n I can't see anything widout specs I am very worried. Will I dies from brain tumour or bleeding.. plz urgently help me.. I beg u sir plzzz... main kya karun