What do you mean, return to your waves of
anxiety? You mean what you had before you took
Effexor, or something different? If something different, it may be continuing withdrawal -- symptoms aren't just physiological, they can also create emotional difficulties. If the same, it means you never solved your original problem, you just medicated it, and probably weren't ready to be off medication.
5htp is a metabolite of tryptophan, and manufactures serotonin in the body.