Heyo, 19-year-old male here.
Last week I had some sharp twinge-like headaches in the back of my head which I put down to tension headaches. A few days from that I got this dull headache all of a sudden, accompanied by mild nausea (felt like "normal" headache induced nausea).
During the evening of the same day I semi-suddenly felt somewhat dizzy while being on the computer. It felt as if the floor was bouncing up and down beneath me and I felt it more prominently when I got up and walked. I've had this in the past so I didn't think too much of it. I still had the feeling of going up and down the next day but it didn't bother me too much so I dismissed it.
However, for the past two days I've had a pretty persistent, dull headache on the right side of my head that makes me feel somewhat nauseous. Being the hypochondriac I am, I'm of course already frightened that it'd be a tumor or something of the likes. When should I get worried if the headaches and nausea persist?