This is true, to go from having literally everything done for you,/deducted from pay to having to your own stuff out can be a culture shock, sounds weird but that's true.
Also lots of ex Service Personnel at AA, NA and suffer with substance abuse.
The RBL/Poppy Appeal are fantastic and offer all kinds of services from counselling, Care Homes, Training, Networking, physical help, meetings/activities they are even doing cost of living grants.
And if you've drawn one days pay from the Military, then you are eligible for help/support.
It really is a truly fantastic charity.