Re: Blocking negative thoughts out
In the past I've treated them the same way as when I get a song stuck in my head - I have to finish the song, get to the end (or as much as I know of it), or listen to it, sing it out loud.
A few years ago I started writing them down or thinking them through to the end, taking them as far as I could so that the particular thought process was over, I'd seen it to its conclusion.
I find that the more I fight my thoughts the more persistant they are (I don't know if this is what they suggest in CBT as I haven't started mine yet), but I wouldn't fight off a pleasurable or happy thought (although maybe I should and see if they become more persistant ).
I guess the only way to find out what works for you is to try different techniques.
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For every day we suffer, there's a day of joy coming our way so tally up your bad days and see how much joy is yet to come.