Thanks hang. That's a good question you ask, and it requires me to think and be more honest with myself than I sometimes am.
Dropping down in stakes alone is not what I think demotivated me or added mental problems. However, it is true that it's tough to go from grinding 100-500s and making a certain $/hr to working harder than before, learning a "new" game, and making less than half of what I used to. I have been OK with this transition from the standpoint of accepting BF was inevitable to happen.
The tougher part to me is watching how the games changed from 2005 to 2008 and then from 2008 to 2012. It's STAGGERING. BF greatest longterm damage done (imo) is further segregating an already weakened poker economy. Like the UIGEA of 2006 it has had a big role in greatly accelerating the decline of profitability for the average to above average grinder. There are so few opportunities for a reversal towards a weaker poker field in the future that the long term prospects of playing online poker are beginning to seem quite unpleasant.
So for me it's not about the stakes themselves. It's the poker economy, the life of a grinder, and the perhaps bleak longterm future of online poker that make me frustrated and less motivated at times. Since BF I've become more involved in a few non-poker projects, and I can't tell you how much more fulfilling and enriching those things are! As I approach turning 30 next year, I'm seeing how attractive the whole poker pro thing is for younger folks but also how unsustainable it most likely it will be over the course of our lives.
How to cope? From a purely poker standpoint I love Jared Tendler's The Mental Game of Poker. From a life standpoint I think the best thing to do is find ways to grow, evolve, and re-evaluate what's really important to you in the long run.
So now I'm just rambling and I'm not even sure if I've answered your question or not! ♦ But thanks for asking and thanks for reading