What are you doing about the PMS?

http://www.mayoclinic.com/health/pmdd/AN01372

If you aren't being proactive about your health, then start now. It is fine to admit that you're feeling sick and that you need help. This link shows that there are options that can relieve some of the symptoms you're experiencing. You don't deserve to live in pain, and sadly, this behavior will eventually wear your boyfriend out. It's not fair to YOU or HIM if you're going through the PMS without seeking help. You want to be healthy right? Luckily for you, your depression and irritability around PMS can be worked with as it's a physical problem that science understands pretty well.

Please don't wait until you get so low that you hit rock bottom. There are options out there now that you need to take advantage of. Wouldn't you like to feel more stable?

To be honest I am not alarmed at the state of your relationship, so much as the fact that it doesn't seem like you're in any treatment for the PMS and that you're not emotionally stable. There are even holistic ways you can deal with it, if you're opposed to prescribed medications.