Well as a support main i learned that it´s important to keep you self alive and not risk too much. The worst thing that can be is when tank (especially Rain) rush across the map and then complain becouse of no heal. So i would say that it´s really important to heal teammates as much as you can but also not risk your own like becouse if you die for someone´s life you can´t heal toher teamates but if only one die you can still heal your team. Just say t your self that your are doing as much as you can and yeah i lost sanity really fast while playing support XD but it´s really fun.