Irregular periods/Extreme cramping

I have EXTREMELY irregular periods. I’m talking, I just started my period today but my last one was August 9-15, 2018. I’m not on birth control or any other prescription medications on a regular basis, they’re just irregular all on their own. My cramps are never too terrible, I normally take an 800mg ibuprofen when they occur and I’m good to go for several days. Well today, my cramps are overpowering me. I have been doubled over in pain and even thrown up from the pain. Ibuprofen isn’t helping today. I took a warm bath, and that didn’t even help. Any ideas as to what I can try? I have to get some sleep tonight- I have to be up and ready for work by 5 in the morning!

Edited to add: My periods are also EXTREMELY heavy! Super plus tampon, extra long heavy flow overnight pad, and I have to sleep on a towel as well as wake up every 2-3 hours to change pad and tampon. This is probably why I cramp so bad, butttt.. and suggestions would be helpful!