So sorry to hear about your loss but pleased that you knew to reach out.
Loss itself is enough to cope with, deal with that primarily. Don't go over the hows and whys, as difficult as that is, it stops you from remembering your wife in the right way, with good memories and smiles.
Keep reaching out as long as you need to, there are plenty out there willing to listen. And don't forget to look after yourself, front and foremost.