orgasm or... not?

It feels like... it's really really really good, I start shaking and it feels like... a rollercoaster going higher and higher but it never ends! I mean as long as my boyfriend fingers me, it'll be the same. It won't end or anything. And I've been told orgasms last seconds, even less so that can't be an orgasm, right? I've heard of multiple orgasms but come on, once we did it for 30 minutes non stop and I felt this during the 30 minutes! Is this even possible?

I've read all over the internet that you get spasms when you come and I get those too but I've always though there'd be something after that, like you know, guys ejaculate and there is an end but I'm my case, it seems there is no end!

Help?