The daily demands and economic struggles of retail can cause stress to build up over time. Here’s how to keep your passion alive, especially as the 24/7 holiday season gets into full swing. For Kris Schmid of Diehl’s Jewelers in Bernardsville, N.J., deadlines are the biggest reason he occasionally feels burned out. As a store owner and bench jeweler, repair and custom design requests often stack up in the middle of a never-ending pile of other retail-related tasks. “It can get pretty stressful,” he says. “In this business, when you need to get an order finished, you need to get it done no matter what—even if you’re on vacation, or it’s 3 a.m. on Christmas Eve.”For Lisa Trujillo, owner of Mark Gregory & Co., in the San Francisco Bay area, the lack of a ­storefront—she sells online as well as at trunk shows and to private clients on location—stresses her out the