I found that a good therapist & DBT taught me mindfulness & learned new skills to function in life along with reinforcing the few I had that were working.
I wasn't eating or sleeping but I did completely remove myself from the situation that was helping cause that reaction in me.
No meds worked because in my case it was a situation that meds couldn't change.
It took about 10 years of good therapy & being 2100 miles away from the situation & I did start healing almost immediately.....but it took those years for all that new learning to become a functional part of my life.
We are never so defective that we can't heal but most time it does take help & someone we feel ok being accountable to. It takes lots of work on our part but so well worth it. I even tested the healing out a few years ago when I went back due to some legal issues & I did not revert back to the previous reactions. Totally possible & I sure never thoughtbit would be the 13 years before I left & found the outstanding therapy