As you know, there is such a thing as Serotonin toxicity, and as mentioned above
Adderall can cause these s/s too.
Adderall can cause frank psychosis. Not a good med to be messing
with at all, unless you are a narcoleptic or something similar. Effexor has some absolutely wicked side effects and some are quite dangerous. Do not smoke on this med. Alone, it is associated with sustained increased BP, which may be some of your "head" symptoms. There are tons of s/e with this med.