When I masturbate, I get this huge throbbing headache that lasts for a

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couple hours, please help!? I've started masturbating for around 5 months now, and only do it like once every 2 days. Everything was fine, up until a couple weeks ago, when I started getting these headaches while masturbating all of a sudden. Each time I masturbate, the headache slowly gets more painful, the closer I get to an orgasm. I also start to feel sick a little after I have an orgasm. These headaches hurt a ton and usually I have to go to bed because of it. I have tried laying off masturbating for around a week, but it still persists, and it is very irritating. I heard from somewhere on the internet (It looked like a legit site) that this could be the cause of a tumor. Sites said that if this problem goes on for a while, to see a doctor, but I don't want to mention this to my parents as it will be embarrassing (Since I'm not to close to my dad, and my mom...She'll think I'm gross >.>) This problem has been going on for a few weeks or so, and I would like it if someone could help. Just a note; I breathe fine during masturbating, and in a correct position (I just put this in there cause some people might question me). Someone please help!
Also, I think I might be hitting puberty (I'm 16 years old), because I am starting to grow quite a bit, and my armpit hair is starting to grow more also. Maybe this could have something to do wit hit?
Just another side note for people who might question me or whatever, I do not force it, or try too hard, I just do my business and get this huge headache for no reason.