Any cognitive problems I think I have, are fleeting, and due to poor sleep. Not nearly to the level of the M.E. camp though, who seems to hit much harder with this key symptom.
I have looked for a lot of other possible diagnoses, but still feel the more general CFS applies to me, and I know from some others on here as well. The fatigue that doesn't go away, not revealed by tests, muscle aches, worst in the legs, OI meaning I feel far better sitting in bed, semi-upright, rather than head flat or completely upright. Also more general is palpitations and muscle tremor, but these appear more when I exert more.
Coming off the benzos makes the fatigue even worse. In fact, it's very interesting to read people who have abused benzos for years at a time, reading their withdrawl stories and seeing just how much it can mirror this disease- severe muscle aches, fatigue, badly effected short term memory, worsened insomnia. That's why more neuro research and it's effects on the rest of the body are critical.