Yes, I do, too. It is one of the symptoms of bipolar disorder. It also could be med side effects or ADHD, etc.

I couldn't concentrate on reading for a few years which I hated. My concentration returned. Maybe it was med-related then.

I take Wellbutrin for depression and for its ADHD properties. My pdoc said I don't have ADHD and that my concentration problems are due to bipolar disorder. He tries to keep me away from meds that create "brain fog," like Topamax. He calls it Dopamax lol