Stress - How do you deal with this??

I've never been so stressed in my life than I have been in the last few weeks. I couldn't sleep, couldn't eat, my skin has broken out, my face is still covered in pimples, it's depressing.
This is the first time in my entire life I've been so stressed I couldn't eat. Anyone who knows me knows I can put away the food, so to lose my appetite is serious business.
How do you people deal with stress like this every day?

There have been many times in my life where I should have been stressed but wasn't. Move to Qld at 19? Nope. Break up with long-term boyfriend? Nope. Quit job and move to a regional city with no job lined up? Still no stress.
The cause of this stress: MrC's family. Are you really surprised?

After the fiasco of his family trying to invite every man and his dog to our wedding I was at my wits end. I immaturely wrote something along the lines of "I wish people would be happy for us instead of trying to push their agendas onto us for our wedding. I'm stubborn and won't give in, so give up" on FB. Yes, I know, I put it on fb, what was I thinking? I was thinking that I'd had enough, and wanted to get my thoughts out.
What ensued was a big fb lecture from basically all of MrC's family calling me selfish, immature, calling my friends sluts, skanks, fuckheads for commenting along the lines of "Go MissK! Your day your way!"
The behaviour of his family was disgusting. I hadn't mentioned any names, but they knew it was aimed at them so they attacked back by name-calling. No where in my post did I mention names, or resort to name-calling.
Anyway 2 of his uncles were the ones to use the names skank, slut, fuckhead etc and I told MrC I need an apology from them before I'll speak to them again.
Their reasoning for name-calling is because I put it on fb they can call me names. I must have missed the memo that 2 wrongs make a right.

Anyway, last w/e MrC's cousin had a confirmation at a church and I told Pete of course we will go, I will be civil but I want an apology. At the church MrC made us sit next to one of the uncles, AND invited him to sit with us at lunch afterwards! I was ropeable.
MrC likes to keep the peace and just thought ignoring my feelings would be best for everyone. I was disgusted, ashamed and hurt that he wouldn't support me. He would rather sweep things under the rug than say "Hey, what you said was really mean and uncalled for, you need to apologise for your behaviour." But no, he just ignores it.
Later in the week I told MrC that it upset me, he called his other uncle to tell him he needs to apologise, he told Pete he will if I write sorry on FB! I told him his uncle can jump. We won't be attending any family functions with them there until they apologise.

Name-calling is disgusting behaviour and will NOT be tolerated, it doesn't matter what I did, name-calling is not the answer. I can't believe men in their 50's think that calling people names is acceptable.

His family disgust me, I am disgusted with how MrC handled it and I will not tolerate behaviour like that.

MrC and I sorted ourselves out and are happy but I am still upset with his family for attacking me like that. They should be ashamed of themselves but they think they did the right thing.

Needless to say they won't be invited to the engagement party or wedding until they apologise. That is that.