Dealing with deep regret after a permanent choice

Assalamu Alaikum everyone, I wanted to talk about something that's been really hard for me lately and would love some advice on how to handle these feelings. Here's my story: when I was younger, I needed braces, but it wasn't covered and my family couldn't afford it. My dentist suggested composite bonding instead since it was covered, and it would fix the gaps. I had that bonding for around 10 years. Over time, it didn't look good anymore-it chipped, got stained, and my gums got really swollen. When I first asked a dentist about it, they said it was fine and even suggested my cleaning routine was the problem, even though I was taking care of my teeth properly. I later changed dentists, and the new one explained that the bonding edges were open, which had worn down my enamel and caused serious gum issues. He said the best long-term solution would be crowns on six teeth, and veneers for the others if I wanted them to look better. I trusted him, especially since he was Muslim, and I felt more at ease proceeding. On the day of the preparation, when my teeth were shaped, it suddenly dawned on me that this change was permanent. I panicked. I started crying and honestly fell into a deep sadness after that. I cried during my prayers, constantly making dua to Allah to help me through this. I kept wondering if this was a test or a trial. I've truly never felt this down before. Alhamdulillah, it's been over a month and I'm slowly feeling a bit better, but I still struggle with overthinking and regret. One of my big worries now is having dental issues later on. I also keep blaming myself for not seeking another opinion or praying istikhara before such a major decision, even though I know I can't change what's done. For anyone who has experienced strong regret or a choice they can't take back, how did you cope and move forward? What helped you stop dwelling on it? I would really appreciate any advice because I'm honestly still finding it tough. Jazakum Allah khair.