I'm so so sorry Mantra, for you and your two lads. We've lost two family members over the years to suicide and it leaves a horrific gap in everyone's lives. Auryanne has it just about right (sorry for your loss too, Auryanne):
"Grieve your own way, in your own time, there are no right or wrong ways to grieve. Embrace sadness, anger, shock, fear, and whatever comes to you. Talk to your DH. Scream at him. Cry for him. You are right to feel angry, you are right to feel however you feel. It is unfair, it is shit, it is absolutely fucking crap."
You've often spoken on Litter Tray about how Little Monsieur has a real gift for comforting people, I hope he can offer you that comfort now (rather than being a teenage dickhead) - and you for him. MCat was originally your DH's cat, right?
I agree that contacting SOBS would be a good move, if you feel up to it. Are his family giving practical help with the formalities and organising etc? It can be good having emotionally restrained people around sometimes if they take on all the official stuff and thus leave you the space to grieve as you wish.
Wishing you strength!