I do think the right kind of therapist can understand what you're talking about, either from having many clients with those feelings and exploring them thoroughly or maybe from having similar feelings themselves. And if they don't understand, they're not somebody who you want to work with because the potential for being retraumatized is very high. I hope you can find the healing that you're looking for because I know from experience that that longing for a mother figure can just be a horrible, gnawing pain.