Sjogren's is an immune system disorder most commonly identified by dry eyes and dry mouth, but vaginal dryness is among the additional symptoms. For a vaginal moisturizer, be sure you're starting with a product designed to be effective for that purpose (and Yes and Emerita are among the favorites we offer). Normally moisturizers are used twice a week, but with a condition like Sjogren's, you may increase that frequency.
For a lubricant, I'd recommend a hybrid (like Sliquids Organic Silk) or a silicone (like Pink). The silicone lubricant will last longer and feel more slippery, which usually means less discomfort. The hybrid, which has some of the benefits of both water-based and silicone, may be your choice if you use a silicone vibrator. If you want to experiment to compare lubricants that are water-based, hybrid, and silicone, we offer a Personal Selection Kit so you don't need to invest in a full-size bottle just for a test!
You have plenty of options in managing your comfort and Sjogren's! I wish you the best of luck.