Hi B W & Welcome!

BW, how is your nutrition? Do you eat a lot of sugar and processed foods? Do you drink a lot of soda or Red Bull or such? I find sugar and caffeine can give me 'ups' and downs.
Do you take fish oil/omega3? - There's a woman in Stephen Fry's documentary who takes fish oil and is bipolar-free. I highly recommend watching that documentary.
Things to consider, if you wish to be relatively med-free.. (I wish as little meds as possible too)

Drug use can make things bad, even after discontinuation, you were possibly 'self-medicating' with the drugs, so it makes sense that it would get worse after rehab.

People with borderline personality might need a support group, do you have a good support system?

There's a schizoaffective sub-forum here, not sure if you might have that or bipolar with psychotic episodes - these are just labels and we are people...

Too sleepy to post anything more right now, just ((hugz)) & know you are not alone!