I started getting the pain and 'clicking' in my thumb 2 years ago. Doctor recommended surgery.
My thumb was to the point that I could no longer move it without excruciating pain.
I started taking a couple of teaspoons of sesame oil each day orally for another issue I was battling and started noticing the pain going away on my thumb and getting mobility back. It felt 100% cured. A few weeks ago, it started to stiffen again, I took the sesame oil again, and it stopped again. Never read about this, it just happened.
I was taking some oral oregano also at the time, but not for as long as the sesame, but wanted to mention in case it had helped a little also.