Go for walks. If you're crampy, take a cramp-specific painkiller like ibuprufin and go for a walk somewhere nice. Walking clears the head and the exercise helps produce happier hormones.
Try to get as much sun as possible. It's really tempting to stay indoors and hide, lol, but sunshine really makes a difference!
Use herbal teas like passionfruit to produce a sense of calm.
Do something creative! Use that energy for something else than angsting. Draw, paint, get some hobby clay.. I used to crotchet and even weave bead belts on a loom, fiddly things kept my mind busy..
Avoid people you just know
are going to aggravate you. If you can't possibly do that, drink more passionfruit tea and count to ten while taking deep breath, before you speak.
And there's nothing really wrong with tears. Get a huge box of Kleenex and hire Sam I Am
or the like, and let yourself have a good cry.