Quizzickle - I'm sorry to hear that nothing can help to pull you out when you slip, but it's good that you recognise how the cycle works for you - I hope that one day you can find something that does help to pull you out of it 
Piraeus - I'm much the same, I sing the same songs over and over again. My current favourite is this one - I just love the riff  and the lyrics are so inspiring!
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“The great pleasure in life is doing what people say you cannot do.”
~ Walter Bagehot ~
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