Seriously, take care of your health and everything else will call into place. Trying to ignore something will only make it worse and not knowing whats causing the symptoms (or what caused an injury) will only make you worry more. Exercise (walking its actually really good exercise) and make it a weekly routine. You will be shocked how much of a difference it makes for your mode.
I also realised that I am a social person at heart. I just finished university and I miss all my good friends who all live in different parts of the country. Not just friends, but family. Its made me realise that keeping in touch is absolutely essential no matter what.
Lastly, don't be afraid.
This has been something that has been nagging me all my life. I really struggled with taking risks in my just-starting-career and social/personal life. Life is too short to think "Maybe I won't be..." "I don't think..." and so on. This is part of my incredibly short list of resolutions for next year and the rest of my life.