continue taking the SSRI it may reduce anxiety side effect from stimulant.
consider adding guanfacine it may reduce anxiety side effect from stimulent
continue taking ativan but only in the PM as mixing benzos with stimulents not ideal

I'm in the know on this one. I took vyvanse for years without a problem. than i developed anxiety and couldnt tolerate tiny doses of stimulent. it wasnt until i got on ssri guanfacine and stimulent was i able to tolerate it again. if your choosing to take benzo and stimulent make sure your making strides forward economically speaking in life, because it's not worth it unless your using it to improve your environment