Clit stimulation

All I've ever done is clit stimulation. I do it till I Reach this peak and it feels really good. I'm not exactly sure if it's a orgasm or not. I get hot and kinda sweaty after but it's not too over dramatic. But after I reach this peak I'm done, I don't want to do it anymore and if I do I almost feel sick to my stomach. So is this normal? And also it only takes me a minute or so to reach this point, so is that also normal?