Sudden period pain

[W1A]

I haven't had period pain since I was a teenager, however this month it's suddenly come on. Does this happen, or should I be concerned? The pain is above my right leg and was so painful I couldn't walk more than a few steps without stopping for breath earlier.
I've taken two ibuprofen and its dulled if I lie down but begins again if I stand up. High pain threshold, I'm not being a wimp!
Normal?

Has the pain gone now?

I have dysmenorrhoea and I can literally be fine one minute and then in agony on the floor the next. It can appear out of nowhere. Sometimes very sharp pain on one side and I can’t stand at all. There have been occasions where no amount of ibuprofen helps, or like you say, it may dull it slightly but it doesn’t go away.

If the pains gone I would wait and see if it happens again next month.