To communicate.. Whatever you do don't come on with a lot of emotion. Strong emotions freak me out. If it is regarding my own emotions I'd approach it by not even talking about it and then sort of.. discreetly guiding the conversation that way.
And as far as being upset or stressed out, well I've had one piece of advice that has stuck with me, compliments of Dr. Drew: Just work on one thing at a time. If you are unhappy with your work, your car, your relationships, your house, your friends, etc, just work to make one of them better. Sometimes other things will fall in line, for instance I was tired and burnt out of living in a party house. I'd grown to hate my deadbeat roommates and their leech friends, stressed at work, the whole nine yards.
I worked on just getting a new place, and by moving, my angry ex friends did all the work in 'divorcing' me out of the loser circle which I wasn't too concerned about. My unhappiness with work dissolved now that I had extra pay freed up to spend on something other than bills.