"just started brintellix 3 days ago. been on effexor xr 225mgs for about 8 yrs &amp; it stopped working. doctor told me i should be done with effexor in about 10 days. ugh. i dropped immediately to 150mg &amp; starting to feel bad. i really want this to work but worried the effexor withdrawal will get the best of me. anyone else made this transition?"