Well first off, know that you can vent your frustrations and discuss concerns you have with us...maybe we're not your close friends, but I have gotten some wonderful feedback and advice here...and you can ALWAYS find someone who feels the same way that you do and can offer help.
In reference to your situation, I can definitely say that I know what you are going through....you're not alone! I've always thought of myself as very independant and I'm usually pretty good at dealing with "drama." Whenever me and hubby fight, I get upset in a way that makes me physically ill. I can feel my blood pressure rising and I feel sick to my stomach...I have a general feeling of worry, as if I've just been told that someone was in a horrible car accident and might not make it out of surgery alive...and I'm just sitting there waiting to here from the doctor. And because me and my hubby are physically seperated at the moment, it's even worse because when we "make up", we aren't actually able to give each other a hug or kiss when we say "I'm sorry."
The best advice I can give you is to try to focus on other things. I know it's hard to but that seems to work the best for me. Call a family member, catch up on those emails you've been meaning to send to your old friends, try to bake a new dish, or do something else that you enjoy. For some people, if you just try not to think about it and focus on other things, the "pain" will ease.
Of course, I good ol' fashion cry never hurt anyone either...and usually does make you feel better afterwards!
I have a psychology degree and I was a family counselor for 3 years so if you want someone to talk to about details, you can PM me.