Vyvanse, Zoloft & Hydroxyzine

My husband has been having panic attacks and dissociative fugue. He’s been taking Vyvanse for a couple years now. His doctor just prescribed Zoloft daily and Hydroxyzine as needed. However we read online that they can have life threatening side effects with the Vyvanse. We’re worried but know his doctor knows what she’s doing.

To qualm our fears, we wanted to ask: does anyone take these together or has taken them in the past? And what are your experiences?