As for 'why can't I help myself' - I heard it can be kind of like trying to cut your own hair - not impossible, but difficult, since you can't see the back of your head - that's why therapists or other helpful people can come helpful... to kind of 'figure out' what's going on more easily cause they have some distance, and don't get overwhelmed by the thoughts in one's head...

I do believe in self help and have read many books that have been helpful, have tried EFT and TAT and I go for a walk everyday etc. I still sometimes have had 'bad days' (partly based on weather and nutrition and things to do) One can know how to deal with these things and just 'forget', or new and unforseen 'more difficult' circumstances might happen (that's why rereading of books or programs can be helpful), and finding people who have been going through similar things...