Kumid, don't be too upset by the diagnosis. You're still you. You are not a diagnosis. If "PTSD" seems too scary and clinical to comtemplate, you can think of yourself as someone who experienced some traumatic events in your past and now you are going to work on healing. I find it less scary when my therapist and I talk about "trauma" rather than "PTSD." We used EMDR and talk therapy to treat the trauma. Your therapist will probably talk to you about different ways trauma can be treated and you will have a big say on what route you want to take. Your therapist will not force you to do anything you are not comfortable with or that you are not ready for. If she seems to be going too fast, you can tell her you need to slow down or that you need a break from the trauma work.
The first therapist I went to worked on depression with me and did not have any idea that a root problem for me was trauma. She never mentioned trauma to me at all. My next therapist figured out trauma at about our first meeting. I just think sometimes they look for a diagnosis that is within their expertise. If they don't know much about trauma, they may focus on other simultaneous conditions. Trauma is often complexed with depression, anxiety, etc. So I think it is not unusual you may have gone to professionals who didn't figure out the trauma.
I am glad you are now with someone who knows how to treat trauma.
Good luck. Remember, you are the one in control, and you can tell your therapist what is and is not working for you. You don't have to do anything that you find too scary. You also need to build up a lot of trust with your therapist to do this work, and the trust building itself can take time.