My day was going ok until I had a strange headache that lasted about 5 sec. During that time I felt queasy for half a second which had never happened to me before. And it left a weird burning tingly feeling on the right side of my head for hours later. I didn't do anything unusual that day, but the previous night I was on the phone for several hours (On a Mobile phone not a Cell) Admittedly I'm 18 and I do talk for long times on the Mobile almost everyday, and only now I'm extremely worried I might have a brain tumor. Please somebody help I'm really nervous!