Same, along with some other stuff called Selenium, I have really bad joints as explained before here, last week my knee locked and I couldnt bend my leg, it was a killer, Ive taken up some stretches that a friend of a friend showed me how too do, that helps abit too.
Not surprising considering how heavy the guitars you play are...have you tried those disposable ThermaCare heating pads that stick on with adhesive and stay heated for a few hours? Used to use those on my neck and back on bad fibromyalgia days before hitting the stage. They are a Superior Force Of Natures-send.
At the time I was drinking that amount, It didn't seem excessive, you are in that enviroment and I was there from 6 until 12.30ish, if you spread those drinks over that amount of time it doesn't feel like you have been drinking heavily really.
once out of that business, I made the effort to stop drinking during the week as a rule so now I'm like most people, just have a dink over the weekend