The first rule of communicating your stress is simple: talk only to people you trust and that can really help (even if only a little). For example, if you have problems with your work, try to talk about it with your boss - he's the one who should help you. Do not discuss it with other employers unless you know they will be willing to give you a hand.
Another thing you can do in case of work problems is just taking a few days off. Oftentimes most of your stress-induced problems are born from weariness and all you need is some leisure time in order to rest, relax and fix you. However if the problem seems to be a long-term one and taking a break does not help, consider changing your career - this is not a disaster and the result will be better than those awaiting for you if you decide to do nothing.
Relationship problems are also best talked over. If you feel bad about anything related to other people, communicate it and talk with everyone involved. This is especially important if you have problems with your family member. Without some discussion, no such problems can be solved and the situation will deteriorate to the point when the situation will spin out of the control.
Problems in your love life can also be an important source of stress. If you feel that your relationship is going in a way that makes you more and more stressed, make sure to discuss it with your loved one and openly tell what makes you down. Together you will surely be able to find a solution that will be acceptable for both sides. If it is the other side however, who causes all the problems, and he or she refuses to discuss about it, you may consider increase the distance between each other in order to get rid of the stress inducing situations.
Whatever you do, never let your emotions stay hidden for too long. Communicating with others about your stress if your only chance to relieve yourself of the burden you are carrying. Just talk only to those people who are involved in a situation - and don't be afraid to be frank. You will feel much better and your stress level will plummet.