You might want to also check for other factors from your diet. I'm on dexedrine and klonopin and found that some problems I was having that sound similar to the ones you describe were from unexpected sources. Particularly taurine (energy drinks) and aspartame (artificial sweetener).
The taurine seemed to potentiate both prescriptions (acting as either stimulant or anti-anxiety), but in an unpredictable manner that would vary with factors like diet and time of day, which caused me to go a bit haywire, with symptoms similar to amphetamine psychosis. The aspartame (which can break down into phenylalanine) seemed to cause unstable mood swings and focus problems.
Once I cut both out of my diet I found I had significantly less anxiety and concentration problems, and stopped having random peak/crash cycles. Obviously your mileage may vary and you may not be consuming either of these, but on the off chance you are, consider at least temporarily removing them as possible variables.
