From my perspective, both of you took too many drugs, in a setting you weren't prepared to handle, and instead of allowing things to play out, you got scared and panicked. That'll leave a mental impression for quite a while even if nothing physical has happened.
There's an important difference between taking a reasonable dose of psychedelic with a sober sitter you trust, in a setting and time that is comfortable for you, and taking, frankly, an overdose of psychedelics in tandem with someone who is just as unprepared as you are. If you want to write a novel, you don't pound on a typewriter with both fists and expect results, you must use your tools with some finesse.
It sounds like you should find someone who is experienced enough with psychedelics to act as a sober guide, if you decide to dose again. Stick to one drug, don't overdo it (more is not neccesarily better), and allow things to play out - if you get emotional, feel the emotions, they are there for a reason. Communicate with each other and your sitter. Maybe unpleasant feelings, topics, or memories will surface. Teach yourself to accept them rather than fear them.
It also helps to plan some sort of activity to keep you occupied during the trip. Walking around on a nice day and talking, or doing arts and crafts together, or sampling interestingly-textured food, or even just sitting and observing and being mindful are all ideas. Taking psychedelics with nothing to do tends to be a bit of a waste. Don't just be sedentary either, that's for alcohol and ketamine.
In the meantime though the best way to heal is the same as ever - stay active, get enough of everything in your diet, practice sleep hygeine, be patient and confident you'll feel better, and fill your time with things that bring you joy. My advice is to not get lost in the maze of supplements or attempting to micromanage your brain's chemistry - a lot of that stuff is no better than placebo. Rather than consuming 5-HTP or tryptophan supplements which cost $$$ and only provide one amino acid, you can just eat some salmon or cheese, which has all 26 amino acids plus some calories and fat. A multivitamin should be all you need and even then that's usually just for sanity's sake rather than a requirement.
By the way, being scared of personal change is understandable but once you think about it for a bit it doesn't make sense. You wake up every day a slightly different person than the day before - that doesn't seem to bother people. LSD or any other psychedelic are experiences. that's all. Like any experience in your life it's up to you to decide if it's a good one or not. But you should take some comfort in that the vast majority of people taking psychedelics tend to see the change they produce as positive. You don't see very many people whose lives have been totally destroyed from psilocybin mushrooms, the same way you'd see with alcohol, meth, or opiates.