To start I was the one in the wrong. Totally in the wrong I am all too aware of this.
I have said some completely unforgivable things to a close family member (that I love to bits) out of sheer temper (exhaustion,pms you name it...)
I have taken it back and apologised and am now giving her some space. What should I do? If I could unsay it I would but I obviously can't and it's out there now 
I can't put details as it could out me and I don't think I could bring myself to say it anyway, I'm too ashamed