Dear Prudence Prudie chats with Lizzie O’Leary, host of What Next: TBD, about a burnout when you’re supposed to be happy. Photo illustration by Slate. Photo by Getty Images Plus. Each week, exclusively for Slate Plus members , Prudie discusses a new letter with a fellow Slate colleague. Have a question for Prudie? Submit it here . Dear Prudence, I’m close to my family, who’ve all been going through major (but positive) life upheavals. In the past three years, there’s been two weddings, the first baby born among my siblings, two house moves, one parent’s retirement, and the other parent’s major milestone birthday. All of these things have included celebratory dinners, bridal party festivities, housewarmings, baby showers, etc. But there’s something keeping me from enjoying them fully. In my own life, I’ve been dealing with some hurdles. Namely, a health scare and the rough end of a long-term relationship.…