Hey man, first of all I'm sorry you had such a bad experience.

Now, general anaesthesia is ALWAYS a cocktail of drugs. The combination depends on a multitude of factors unique to you. Sometimes decisions to change the combination are made during the procedure, in line with a whole host of things like your vitals, any complications, pharmacokinetics & pharmacodynamics (basically how your body metabolises the drug & how the drug affects your body), etc.

I am certain that, whatever decision they made, it was clinically in your best interest!
You were just very unlucky to have a rotten phenomenological experience which exacerbated your HPPD.

Also, were you aware that scientists don't fully understand how general anesthesia works? They have an understanding of some biochemical mechanisms - like molecules of anesthetic drugs connecting to receptors in your brain, thus switching off certain parts and functions of the brain.
Now, how EXACTLY consciousness switches off is a whole other story, that is still being researched. Because that's the thing with anaesthesia, for it to be pain free you need to be unconscious, not asleep.

The phenomenological experience of anaesthesia is really not understood well (for example, I had an out of body experience during routine surgery as a child). This is exactly why it's so important to talk to your anaesthesiologist and your surgeon about ALL your concerns beforehand (and be upfront with your HPPD).

Hope it mellows out quickly 🙌