I went swimming yesterday and since then I've been cramping and it's gotten worse , now my back…

I went swimming yesterday and since then I've been cramping and it's gotten worse , now my back hurts pretty bad. I've taken a warm bath which usually calms down cramping when I get some but it surprisingly didn't work and it's making me so fucking cranky and annoyed. Right when I feel like I should go in everyone with a car here decides to go party and ignore my calls. Anything else you ladies recommend that has calmed down similar symptoms?