I, too, agree with WAC. - on his *first* comment on this thread, not the follow-ups~!!
Maybe call your uncle, tell him you are going through a stressful period right now (it's not even a lie or exageration, is it?) and it was really wrong of you to vent on your mom. You knew it was wrong as soon as you said what you did and it won't happen again. You are thoughtfully and prayerfully working things out. You truly appreciate his concern, love, support and encouragement and will call you mom to apologize for venting on her and causing undue concern on her part.
Then go out and make something really GOOD happen for your and your wife! If you claim 'stress', be ready to quickly start working to alleviate that stress. Starting January 1st (only TWO DAYS AWAY~~!!). Take a class together. Take regular hikes or some other such activity that takes a little time out of service and or meetings but is fun for both of you. (A strong-in-the-truth witness I know has recently taken up bicycling and has even enterred some competitions or other such big bicycling events. To my knowledge, no one is giving her flack for it.)
Once you talk to the uncle and make quick peace with your mom, Phase II of your fade has then begun. Congrats!!
-Aude.