How to orgasm?

So my boyfriend has been messing around with fingering me but I still don't think he's making me orgasm. He wants to give me oral but idk how I feel about that. I'm taking antidepressants so I know that that can cause sexual disfunctions. I've never mastrubated to the point of an orgasm before so idk what it feels like. Tonight I think I was very close but it got really painful all of a sudden. I mean when he stopped I started crying not in a bad way though and I needed a minute to catch my breath. Was that climaxing? What should I do?