I was on Humira and leflunomide which was working great, but due to mouth ulcers doctor switched me to Xeljanz. After 5 weeks still experiencing severe knee pain, fatigue and sore throat. Just added leflunomide back 1 week. Xeljanz has helped remove nodules that I have had for 15 years so it is doing some good but not sure it's worth staying on due to knee pain, fatigue and constant sore throat. Anybody relate ? Should I ask to change back to humira or will Xeljanz get better ? Help?