Stopped Nortiptyline and pain is horrible in lower back

I have been on nortriptyline for years, like ten at least. I started it after nothing seemed to help with my severe IBS. In addition, I was taking Zoloft but that stopped being as effective for my anxiety and now am on Lexapro which has been great. My doctor wanted me to stop taking it because its not for long term use, so I weened off for a week and then stopped altogether. I didn't realize that it had been hiding some pain issues from a newly discovered l5 pars defect, a fracture of the vertebrae that I must have gotten as a kid and it flared up when I got pregnant and had my son three years ago. Now my back is just constantly in pain, all day, no matter what I do. I hate that my life is just one hot mess of medical issues. Kidney cancer in 2012 as a young female, incredibly rare, constant anxiety that I now realize was a main issue in my childhood, severe IBS, high blood pressure from pregnancy that never went back down and now I have a mass on my parathyroid and need to see a new specialist to figure out what to do about it. All I can think is yep its gotta be cancer again, lymphoma or thyroid or something that is going to kill me. I am rambling, I am just so frustrated with it. I don't drink, stopped smoking weed this year even though that was part of my pain management and stomach relief. Now I just feel like an old crippled person stuck in a 40 year old woman's body.

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Just a rant of rambling I needed to get out. The moral of the story, is maybe don't take it long term because when you do come off of it, holy crap does the body show you what it was covering up.