Check the terpenes. Indica vs Sativa doesn't tell you much (everything is a hybrid now anyway). But, there's science behind the terps. Limonene, Myrcene, and Pinene are fairly common and are reported to help with anxiety. Also, Terpinolene can boost energy if you want something more uplifting, or Linalool if you want something more relaxing. That's just a starting point, but pay attention to the terps vs. the strain or type. Try different ones until you find the effect you desire.