I know the feeling. You are so NOT alone. My mom died 16 years ago and sometimes I can still feel it like it happened yesterday. Due to family dysfunction I did always feel alone until now. Grieving is ongoing I believe. It got a little easier over the years about my mother, but it will never go away, and that's just okay. I have to grieve what was lost of my childhood and early adult years. It will take time, and that's okay.
I just don't believe we have to get over it. We come to an acceptance I think, but are never truly "over" it. I believe that's okay. I'm glad you have such a friend to be there for you. We are all on this forum for support. I hope that helps you to not feel so lonely. I hope that your heart starts to mend you can find others to connect too. PM me anytime if you'd like.

I will keep you in my prayers.
May I ask if it's possible that you can change therapists? It doesn't seem like he's the right match for you.