PLEASE GET PROFESSIONAL HELP FROM ANOTHER DOCTOR RIGHT AWAY. Here's the framework I see; recent startup founder + therapy for seven years + abused as a child + ten pills per day. This alone screams for professional help. I don't think that a fellow entrepreneur can help solve all of your problems. There's also the danger of making it worst because of not having any training on how to deal with your framework. Now to…
Wow! You're doing exactly what you seem to know on some level is bad: you're giving him lots of very specific advice without having any basis for doing so. Apologies for any harshness but I want to answer you strongly. 1. It's very possible that leaving his current therapist in order to "pivot" is a terrible idea. He should talk to his current therapist about his feelings that therapy isn't work, and consider talking…
It is my experience that if things aren't working with a current therapist--whether this is the case needs to be seen, but after 7 years with the same therapist, he's on 10 pills/day, he experiences a serious relapse and feels he has to call on HN for help, is not a good sign. After 7 years there should be some more professional safety-nets installed.
Anyway, if it's not working well, get a new therapist. From personal experience, sticking with the same one for too long while you know it's not going further has done nothing but slow progress. The reasoning is, a therapist is also a creature of habit and they're not going to change their general approach much, even if you discuss the matter with them. And I don't mean trying out different meds or therapy, but the sort of general approach they use in their profession. And there's nothing wrong with that, even the really good ones do it, and even with them I still got stuck after some time, simply because their bag of tricks (as good as it may be) ran out and we tried all the things. And that's nobody's fault because therapy isn't a hard science or engineering problem, so it's very possible that even the "best" one runs out of ideas while another may have some approach that fits you right now (which is another factor: a patient changes as a person, the therapist that was right when you were at point X in your life may not be the one you need right now).
Disclaimer: this may be bad advice because of reasons of US Healthcare that I know nothing about. So, Think For Yourself. But also don't go waiting for a therapist to fix things if it doesn't seem like they're doing that. Which I need to repeat, is not (necessarily) a failure of the therapist, but sometimes a new pair of eyes can get you moving again, if the old pair got stuck.