Yup, that's me. I wish I had taken the info from this thread to heart. I thought I would enjoy being a fellow in nephrology but that quickly faded away as I grew to resent the specialty fairly early into fellowship. The day-to-day is brutal with 25-35 patients on a list for mostly BS consults, the weekends of being in the hospital 5a-7p then being paged every 20 minutes the entire night then working 5a-7p the next day with minimal attending assistance or even an offer to send me home after a sleepless night. You'd assume this was at a small rural program, but that's far from the truth. I was at a program that never went unfilled in the last 10 years and my PD was baffled that anyone would even attempt to leave. At the time it was a full-blown crisis as I didn't have any backup plans as far as a job and I still had to take IM boards later that week. Luckily, my program was quite supportive and the leadership talked with future potential employers I was interviewing with and looked out for me to make sure I got my feet back under me. All I knew was that I couldn't stand going back to work as a nephro fellow again no matter the cost.
Part of me wonders why I didn't have a good hard look in the mirror before applying for a fellowship, but as someone who went to a low-tier med school, and a small IM program, the allure of a prestigious nephro fellowship was intoxicating. Looking back, I'm somewhat glad I went through the experience so I wouldn't be wondering "what if" for the rest of my life. I have absolutely zero regrets now that I've started an attending IM job and finally am getting some enjoyment out of work. I tried to be productive during my short period of unemployment including trying to become as financially literate as possible with the looming attending salary that I wanted to spend consciously. I never had time to think about anything financial during residency besides contributing to a Roth IRA, but now I feel that I have the financial tools to get my loans taken care of and hopefully retire a little early. None of that would have been possible if I hadn't left fellowship. I was at rock bottom just a few months ago and now this is the best I've felt about myself in years.
I've been reading this thread for years but always thought "It won't happen to me". I'm just glad that I was able to get out early and not be a victim of the sunken cost fallacy. After that Reddit post, I received several DMs from current first-year nephrology fellows who felt the same way but couldn't commit to leaving for one reason or another. I hope they find some sort of peace.