@thatgirlneedsakidney, Congratulations on your 1st year with your transplant! I want to commend you for mentioning that you are working with your doctors to adjust your medicines. I am 13 years post liver and kidney transplant and I get the trembles on occasion even to this day, but nothing like what I experienced in the early post transplant time. Mine was apparently caused by my immunosuppressant meds, which I learned to live with due to the need for a particular level on immunosuppressants tom protect my organs. Over time I hardly noticed them, except in periodic times of stress. I also find that coffee/caffeine can be a culprit to increase the trembles.
Anxiety after can be made more problematic because of our medications. As I already said, you are doing the right thing to consult with your doctors about the immunosuppressants, and the anxiety medications. I hope that time will lead you to a resolution.

Were you prone to anxiety before transplant? Did you have a major medical event prior to transplant surgery that might be inducing the anxiety? I know that some people who have been hospitalized or spent time in ICU have indicted that they are struggling with anxiety after their experience. I'm just thinking out loud and if anyone of my thoughts leads you to a solution, I will be happy.
What about counseling? Have you tried counseling along with the medication?