@CheerBear, the time after my second procedure in particular involved some difficult big thoughts and feelings. Not regret, as I fully believed I'd made the right decision. More that it was a big life experience to have had and left me feeling raw.
It needs time to process. As with grief and mourning, I found that the further away from the event I travelled in time, the more accepting of it I became, the less heavy the emotions, and the more able I was to integrate the experience as part of my life.
It's totally natural to be going through this. It might be more of an issue if you weren't, as that might indicate the thoughts and feelings were being buried and not addressed.
My best advice would be to avoid going into overdrive with other issues and activity, and to allow your mind and heart the time to heal.
I know this may be difficult with all you have going on, but go gently with yourself, with your thoughts and with your emotions as much as you can. It won't all be resolved in one moment. But if my experience is anything to go by, you will reach a peaceful place with this over time.
Love to you. 