you sound like you know what you are going to do but need some justification from others to get your blessing. don't take offence but that's just how I read your post...
if you don't go, are you going to resent your sister and nephew as they both can use your help?
if you go, are you worried that this may not be the spark to get you going again and that you may want to go away for another year soon rather than a normal vacation?
you've got some time to look at all you options and buy looking into it now is a good thing.
open you tackle box and look at your fav. bass lure, can you go without that for another year? I only joke with that as this is OFC...
Do what you want, feel is right for you and be happy with the end results.
OR, heads you go tails you stay....