Hey, you made it 87 days without drinking! Way to go! Please don't beat yourself up for your return to drinking; just pick yourself up and move on. What DID work for you to keep you sober during those 87 days? Something did, for sure. Do some of that and then add some other tools.
I have not managed more than a few days or weeks sober in the past several years, so take my words with that in mind. However, the one thing that kept me from trying more sober days has always been beating myself up - it only drove me deeper into the bottle.