I've had trigger thumb in both thumbs and have had a total of three shots in each thumb (base area). The pain was so bad before the shots that I could barely open a door because of the gripping motion needed. I also had tried acupunture with little success.
Right now, both thumbs are ok...not great, but ok. I actually am selling my road bike because I can't use the drops anymore and even with shims, have some strength issues with the brakes. However, I can ride my mountain bike ok and have pretty much converted it into a commuter bike anyway. As soon as the road bike sells, I'm going to see what options I have...handlebarwise for a new bike 
I really think the cause of my trigger thumbs was the pressure due to teaching so many Spinning classes. I teach six classes weekly and at one club, the bikes are extremely uncomfortable (Schwinns) and no matter how carefully I am with my set-up, the handlebars really bother my hands so now I wear a immobilizing brace on my right hand when teaching the classes on that particular group of bikes or if I teach at another club that has Lemond bikes. Luckily four of the classes I teach are on Kieser M3's and I haven't had a problem with those handlebars.
I have also found that massage helps a lot. It's been about five months since my last shot and I'm hoping the third time was the charm since surgery is the next option and being self-employed and having a high-deductible on my health insurance...I'd like to stay away from that if possible.
Vertically challenged, but expanding my horizons.