1) sometimes, the best way to overcome something is to be proactive.
confession: i get really upset and/or irritated when people cancel on me or change plans, in fact, my perspective is quite black and white when it comes to this: if you cancel, especially more than once, i consider you unreliable, and can't help but take it personally.
sure, i have an imaginary box full of acceptable excuses [you or your children are sick, you have to work, something tragic happened etc], but outside of that is ... well, i'll call it like it is, unacceptable, and even inconsiderate at times.
lucky for you, i have since 'chilled out', as two of my closest friends have suggested at one time or another, and have worked hard at not taking such things personally. the reality is, things happen, other things come up, and plans change.
there have been many things that have aided my new way of responding to cancellations, but my biggest tool in overcoming this has been to always have a plan 'B', that way i'm not 'losing' anything, or wasting time wondering why plan 'A' fell through.
for example, say i have plans on tuesday night after work and some time between then and now, my friend cancels. as dramatic as this may sound, the old me would be so disappointed that i would sit at home all night and sulk, but the new and improved and proactive paula would have already made secondary plans [go to the gym, read, blog, catch up on sleep or suits - hello, harvey specter], and will spend the night following through with those instead.
sometimes, conquering something is as 'simple' as recognizing a pattern in our lives, and being proactive with it.
2) don't worry, be happy.
i was on my way to work the other day and found myself stressing about all i had to get done the next day. a few friends needed my help, and though i committed to helping one of them first, i wanted nothing less than to be able to help them both. in my mind though, none of it was coming together timing wise, and i felt torn, and stressed.
all of a sudden, i 'hear' a still small voice inside me saying,
"don't let tomorrow's worries steal today's peace"
and with that, i took a deep breath, prayed a quick prayer, and went about my day; perhaps some of you need to do the same thing today.
[in case you were wondering, the next day worked out just fine].