Lyman is worried that he drinks too much. If you're asking, buddy, the answer to that question is probably yes.
Regardless, Lyman is going cold turkey as of today—but not before taking one final drink, of course.
What's more, Lyman has to face the prospect that he may never finish this book. Shelly will be leaving for school soon, and Ada is looking unhealthier by the day, which leaves him stuck without a helper.