IMHO, the absolute BEST thing you can do to manage your mental health during the first six months of a relationship breakdown - is to exercise hard and long.
Lift heavy things and put them down, MMA or hit a heavy bag, throw something heavy. Unbridled masculine rage on a heavy bag gets alot of feelings out. Bloody hands, swollen wrists are a reminder that you are all that is man.
H37, W37 D4, S2 ILYBNILWY 9/19 BD 9/19 EA discovered 10/19 Currently in limbo, no D or S process initiated