These are my exact feelings lately. Everything I used to like doesn't intrigued me anymore. I'm a donut addict and passed by dunkin donuts the other day and didn't even feel compelled to stop and get a few. I feel 'meh' as well. I have days at wor where I cannot concentrate and just start looking at random websites instead. I was given the green light to increase my Lamictal to 150mgs to help. We'll see if that does anything.
I'm right there in the struggle with you. But I know it will get better. I'm trying to patient. But I know stability is possible, so I'm just trying to wait it out. In the mean time I'm keeping my sleep regular and watching my diet, and all the other things to keep me well. Good luck to you, the patience is the hardest part of bipolar disorder.