Natural remedies for menstrual cramps during work?

I’m 25 and never had a job. I’m trying to find a job right now, but when that time of the month comes around I wonder what I would do if I had to work on the days I was menstruating, since right now I can just sit at home and deal with it in private and comfort of my home because I don’t have anywhere to be. I haven’t used tampons in over a year, and I don’t plan on ever using them again, and pads are horribly inefficient and dirty. I heard of the Diva Cup, and I want to get one of those. But what do I do about cramps? My cramps rarely get super bad, and I don’t always cramp with every period, but when I do cramp all I want to do is lay around and not move. I don’t like taking pain medications and prefer to deal with things in a natural, non-intrusive way. What could I do for cramps, if the occasion arises I have to deal with such, in a work environment? Some kind of tea? Some kind of mild exercise I could do in place while working at the same time, like with my abdomen or something? One of those heating pad things that stick to your body or wrap around and wear? A topical ointment or oil? Aromatherapy? Anything?