77 days is a great accomplishment good for you!
If you can't reach your sponsor or temp sponsor then your doing the right thing by posting here. I know I was having some thoughts myself about 4-5 days ago and I couldn't reach my buddy that has 21 yrs sober...so I reached out to a member here on the site that I talk with every once in awhile "CAPTAINZING2000" and I have to say just having those few back&forth Pm's with him last week that one night really helped me over a rough spot where I was thinking about drinking again.
It wasn't so much what he said or anything like that, but just knowing that there's people here that have went through what we are going through and that they really do care that I (you/we) succeed really helps to keep ya on the right path.
So if you can't reach your sponsor then just post here and there's a ton of great people on this site that are very willing to help you over your tough patches.
Steve