I'm not entirely sure about anything that could actually help you, but whenever I'm feeling down I try to go on long walks, listening to music that makes me feel happy and try to remember all of the good times and try to forget about the bad ones. I know that's probably not helpful, but that's all I got
Other than that, remember that there are a lot of people, even on this site, that I'm sure are willing to hear about your problems and lend you an ear!