When to know if it's a panic attack

I got a little bit annoyed with my boyfriend and for some reason I've just come upstairs to bed and cried and what I got a bit annoyed about wasn't that bad but it's jut built up while I've been texting him and I come to bed and cried non stop for about 15 minutes or more and panicked a little and thought of the worst and I felt like I was shaking a little too and couldn't keep my hands still. I've had one ages ago now but I was going hot and cold that time but didn't this time. I've managed to calm down now