@Tuxmagic I received an email with your response but can see the post has been removed--assuming censorship for whatever reason.
We all make mistakes and it's hard to maintain a rational position when you're feeling threatened, it's ok you acted out in response to the bullying, the important thing is that you've recognised where you went wrong. If it's at all possible to let this person know you regret your actions, it might open up a channel to sort your differences. Is this situation the same or different to the builder you're referring to? Is the builder someone you work with?
Your GP and psychologist should be able to provide ongoing support, even if it's just to check in and let them know things are still sh*t. You don't have to stick with the psychologist you've seen, you can do a google search and find someone else if you want to. Your GP should be able to send on a referral for you. Ongoing support is really important, and especially if you are taking medication and having suicidal thoughts.
You've done well to get to this point and made a great choice in reaching out for support.