Sorry to hear about your situation. I have never had ablation, but I had my thyroid removed twice, well, one half each time. The first time, due to a concern about the medications I take, the head of the Anesthesia Department was my anesthesiologist. The second time, with known medications and outcomes, another anesthesiologist handled the anesthesia.
What a difference. The first, I remember being in the prep room, someone administering some medication, then waking up in recovery.
The second, I remember being in the prep room, medication administered, wheeled to the operating room, talked to the anesthesiologist, who told me I would not remember any of this. I had to help transfer myself to the operating table, and the anesthesiologist said I had done so even for my first surgery.
The difference is that I did not remember the first but remember more about the second than I care to. Amnesia is actually part of anesthesia. Unfortunately you remember more about your procedure than you care to.
With knee surgeries over the years (arthroscopic), thyroid surgery, and a cyst removed from my wrist, the one that left me the most anxious afterwards was my cyst removal from my wrist. They were supposed to sedate me, but something apparently got mixed up. There I was in the Operating Room, a sterile field between my wrist and my head. The doctor administered local anesthetic and did this minor surgery, talking to a student doctor all the while. I could hear him saying "this is a nerve, this is a vein" and such. He'd ask me once in a while to tell him if I felt any pain, I assured him I would do so instantly. I was able to leave the hospital immediately after the surgery (after being returned to my room) but my mind was on speed, figuratively, the remainder of the day, very tense with rushing thoughts.
I can't address how it affected you, people react differently to similar events, but many people have gone through ablation, just the same as you, and not had any lasting stress or mental issues. As frightening as it may have been to you, you were in trustworthy hands in an environment prepared to address any thing that may have arisen.
I trust that for the mental health problems you are under a doctor's care?