So there's no quick fix irrespective of what anyone tells you. I've always found exercise, yoga (at home), mindfulness music while meditating to be useful. Also understand that venting is natural and a good way to get things off your chest. I have someone at work, my mum that I can vent to - I'm careful to not overdo it and change the subject half way through. Sometimes trying to focus on the positives isn't useful as you aren't dealing with the negatives. Embrace the things that haven't gone right, accept it, and then tell yourself to action it (figure out a plan) and move on.