Sorry I did not see this sooner
akidagain2018 because your situation resonates with me. I grew up, not dirt poor, but definitely on a shoe string.
I started working at off-the-books jobs at 15 and was working full-time while still in college. When we reached FI late last year, I realized that, excluding vacations, I had been working without interruption for 42 years. (Even when I changed jobs, I always left the old job on Friday and started the new one the next Monday.)
Last December, we reached FI and I started planning our ER. FIREcalc, another calculator, and our Vanguard Advisor all told me that I was in great shape. But, my stress level was spiking and I could not understand it. Then, it dawned on me that it was the fear of losing the paycheck. The psychological "need" to be earning a salary was so strong that the thought of no longer getting one was having a very real and very negative effect on me.
It's been 3 months now. The good news is that I am now acclimating quite nicely.
I hope you do as well!!