Don't talk to your wife about it, you'll show her a weakness, she will start subconsciously resent you, become colder and distant and your stress will double. She has you as her rock, she doesn't want a weak man to rely on.

Start instead some sport, take care of your body (try sauna + cold baths together), eat brain-boosting supplements, kick out sugar/flour-based food for a month, switch your phone off for 4 hours during work day and tell everyone about your reachability, start learning something on a side which makes you happy. You have a happiness deficit; do something you always wanted to do though don't overdo it, and allow yourself to be a bit happy for no reason ;-)