First and foremost, make sure your therapist thinks you are ready for shidduchim- if the issue is not mostly sorted out, it may be a good idea to wait a little longer before starting up with that; 6 months extra just to make sure you’re healthy enough to date and marry is a drop in the bucket compared to the disaster that can ensue if you go ahead before you’re ready.
That being said, ask your Rav about if and when to bring it up. It seems like a no-need-before-the-first-date-but-sometime-before-you-get-engaged issue, but you still have to ask.
Never be ashamed! the fact that you got help shows a deep level of maturity in oand of itself; also, people have to realize that it’s better to be involved with someone who worked things out, even if they needed help with it, than with someone who let their issues fester and never told anyone about it.