I'm a 20 year old girl. I've been having dizzy spells for a while now. They started last year, around September. I haven't been to the doctor because the spells come and go but there's no specific situation where I start feeling dizzy or lightheaded.

I don't have eye sight issues because I just got it checked and it's fine. 

And lying down or getting up doesn't help. Even when I'm sitting down, they take their own sweet time. Also, they make me feel woozy but never have I ever felt like fainting. But while they last I feel a mild headache and can't concentrate on anything until I really try to. 

Please help.

Much thanks!