I understand that cycle of "I feel better now so I'll let it slide" and then going back to needing help and not being able to seek it.

Maybe at those times when you are feeling bad, in addition to whatever you do to help yourself, also write yourself a note about how bad things can get... and when you feel a little better, refer to that note and use it for inspiration to seek deeper help at those times when it may be easier for you to get out.

I do that as I really isolate myself seriously when I am depressed... so if I have a moment with a little more clarity I will force myself to make a doc appt or at least put "make a doc appt!" on my to do list so that I will go through with it and not get "trapped" between the waxing and the waning.

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--http://www.idexter.com