feelings

when you put yourself into a mind set, you stay in it, like a kind of trance until you have the strength within yourself to pull you out of it. A good example of a mind set is when your heart broken and all you can think of is how much you miss that person or how much you want to turn back time. But as long as you keep yourself in this state the worse its going to be. You're never going to be able to change or speed up the process of healing a broken heart but, i believe that as one emotion takes over you, the other ones are diminished. So, if you keep yourself happy, surrounded by friends and family then your mind has no time to feel sad or alone. there are times when you can't help it, your bound to be alone, but trying to keep this time to a minimum will help you get over heartbreak without you realising the process is carrying on behind closed doors.
Trying to realise the positives behind the negative time you are going through can also help. as emotions are weighed out, so are relationships. as one diminishes, the others take over.  So its all about balance.

this may be pretty obvious but i feel writing down your advice to yourself makes you realise it more as advice, rather that you going insane and talking to yourself. and its always there to refer back to if the time ever comes that you feel the same.
even as i write this, i am not alone. constantly having someone who means a lot to you around you helps a great deal, because it reminds you what you have rather than what you've lost.