Midwife + doula?

I met with an obgyn at a big hospital last spring before my miscarriage in March at 11 weeks. I decided to go with a midwife for this pregnancy- feels much more personal, and less like I'm another patient on a conveyor belt. Someone suggested I also work with a doula to ease my anxiety and add an extra layer of emotional support. Anyone have info on what a doula might add? Or is a great midwife practice sufficient?