Did I have a G-Spot orgasm.

So I have been with my bf for 5 months and after 2 previous relationships that were 3 years a piece and I felt like I had started having sex with them too soon, I decided to wait to mess around and have sex. It is a respect thing for both of us and he was completely fine about it. While we didn't have sex, last night he went down on me and got me off. After that he began fingering me. Now, keep in mind I tried to have g-spot orgasms with my last bf's and I just never could, I only had clit orgasms. As he began fingering me, I starting to get this feeling like I was about to pee and the feeling would come and go, like it was building. I read before that reaching a g-spot orgasm can make you feel like you are about to pee, so I got really excited and than relaxed. Suddenly I felt this rush of heat and my eyes rolled back in my head as my body began convulsing involuntarily. It is like I had no control over what my body was doing or the sounds I made. I screamed and cried really loud at the same time and when the convulsions started to slow down I began balling my eyes out. It was wonderful...but crazy at the same time. It kind of felt like an outer body experience. It is kind of funny, because I was crying and saying "I'm sorry, I'm sorry I am crying" but he just had a big grin on his face. The only thing I am curious about is the fact that there was no cum afterwards. Is there anyone who has had g-spot orgasms but had no cum? Since last night I can't stop thinking about it, haha. Since he knows how to press the right "buttons" I would love to learn how to ejaculate. He said he was kind of surprised by my reaction, because he said his past gf's would squirt, but their bodies didn't go into a fit like mine. So, did I actually have a G-spot orgasm and if so, how can I learn how to ejaculate? Any info would be great. I feel so...GIDDY! I don't know about any other women here, but the first time you have one (if I did have one), it is like a new door opens up and you feel exhilarated, hahaha! Especially since I am 25 and have been having sex for 7 years.