Im wondering if its noradrenaline causing the problem, not serotonin. Here is a cut and paste of dr Mariano's experience with cfs patients and noradrenaline.
[....]
Loss of well being may reflect low dopamine with high norepinephrine levels. Dopamine is the reward signal, the signal that one feels well, whatever the norepinephrine level is - high or low. But the levels of dopamine and norepinephrine may also be a secondary reflection of immune system pro-inflammatory vs. antiinflammatory balance, current endocrine status, current nutritional status, etc.
Loss of motivation my reflect low dopamine and/or low norepinephrine, but also may reflect high pro-inflammatory cytokine signaling, low cortisol signaling, low estrogen signaling, suboptimal nutritional status supporting these signals, etc. etc.
Loss of creativity may reflect the sum of multiple signaling and metabolic problems not just low dopamine or low norepinephrine.
So interesting - I wish I could understand all of the science here, but the above paragraphs in particular caught my eye, especially the mention of "well being" and "motivation," things I experienced after my first dose of amitriptyline for the first time in ages . I loved it. Then everything went into overdrive.