It seems you all share similar symptoms. GAD definitely contributes to the problem.
It may be that your fight/flight system is in overdrive.
This constant anxiety keeps your hormones out of balance.
Poor memory seems to correlate with anxiety.
Questions for you:
How long has your memory been bad?
Months, years?
For the first poster, your brain shut down some of its functions because it is overwhelmed. The thing is, you do feel still but your emotions have been numbed.
I recommend for all of you, exercise, anti-inflammatory diet, and a hormone check up as well as an MRI.and petscan.
DP is almost always caused by persisting anxiety. Overtime,your fight/flight mode becomes overtaxed. When this happens, a series of events begin to develop the longer it stays imbalanced.
Your lack of emotions or anhedonia, even memory loss could be caused by something as simple as an overtaxed mind with obsessive tendencies.
Take care guys.
I almost forgot, do you guys have a healthy sleep pattern?
If not, consider that proper sleep is vital to your health. I would go as far as saying that proper sleep is what really keeps us alive and healthy.