TLDR; Feeling icky again. Worried about the possibility of hitting rock bottom if I'm not careful and take care of myself properly. Any suggestions?

This is kind of a long ass story but I'll try to keep this concise as possible.
Got dumped over the summer and had a really rough time dealing with it. All the emotions I tried to drown came to hit me all at once resulting in months worth of intense substance abuse, lashing out at friends, threatening parents, running away and multiple suicide attempts. Got diagnosed with BPD in Sept and prescribed meds. Changed around a few times with ins-and-outs of hospitals. Took them regularly for a few months. However, they made me feel really zoned out and foggy. I was constantly shaky, too. Mentioned this to psychiatrist, she didnt change any dosages or prescriptions despite my worries. So I stopped them all together. Stupid idea, I know.

I started feeling better - great, actually. So I stopped seeing my psychiatrist and social worker too. Again, stupid. It's been a few months since then and I started to feel more stable then ever. Work is amazing and while my social life could use some improvement, I'm working on it.

Nothing significant happened to change this but for some reason, I'm starting to notice the signs of sinking down in to a bad place again. I've lost all enjoyment in my hobbies, gotten lazy with school, avoided all social interactions, and spend the time I'm not at work staying in bed. No breakdowns, no crises, but I feel like they could be imminent. 

I don't feel very low, but I feel on the edge of it. I feel like if I don't fix or change something, it'll cause me to sink back in to that low. It's really hard to describe, but It's getting me a little stressed, which I'm sure doesn't help.

Has anyone been in this situation? Where the stability you've gotten used to has, for some reason, felt like it's slowly shattering in minuscule ways? How do I stop this from happening?