If ur talking about popping a Prozac whenever your’re having a bad hair day or whatever (like half the population unfortunately does these days) I wouldn’t make a big deal out of it. You don’t need to tell the shadchan, just the guy you’re dating.
But if you have a real mental disorder, it makes sense to tell the shadchan, so a guy can decide if he’s interested in dating you in the first place.
Don’t worry, bashert WILL want to marry you and he’s the only one who really counts.