Is this considered normal or should I go to the doctor?

I don't normally get cramps during my period, if I did it was rare and not too bothersome. Lately, the past two times they've gotten increasingly worse. The first time I couldn't find a comfortable position to ease the pain and had to resort to medicine. The next, which was this time, was absolutely horrible. They started at 4 in the morning and increased in severity to the point where I couldn't stand upright because I would get the urge to throw up and would dry heave. My legs and arms were shaking and the medicine simply did not help. Since they've been getting worse each time I'm very worried about the next time, is this normal? To not really have cramps and then out of nowhere have cramps that had you in tears and desperation for them to stop?