@alh4, One of the side effects of Tacrolimus is that it can cause dizziness. I see that you had surgery 6 weeks ago, and this could be a complicating issue with the introduction of other medications and healing.
I have had tremors after my morning dose , but not dizziness or lightheadedness . I do remember some dizziness and lightheadedness that was related to blood pressure, though.

When did last have labs and tacrolimus level checked? I would encourage you to ask this question to your transplant team. Have you mentioned this to them?

Here is a discussion about dizziness:
- Dizzy still after my liver transplant
https://connect.mayoclinic.org/discussion/dizzy-1/