I am so sorry this happened to you...please accept that from me. No one deserves to ever have to suffer through that.
I think the best thing to do is to, as soon as you can, try to get a definitive answer, be it from blood work or a pregnancy test. Under extreme stress, the mind can actually impose physical effects on the body...it's called psychosomatic symptoms. Given what you've gone through, it's perfectly, totally normal to be under the "necessary" amount of stress to experience that. In something as this, you need to be sure.
As far as discussing it with your t goes, I advise you do so. If you don't feel your current therapist is effective, I advise, if at all possible, you try to find a new one. A professionally trained therapist has the tools needed to help you work through this, but you can't benefit from that if your therapist and you don't mesh, and you owe it to yourself to be able to have some help in this. You don't deserve to have to go through this alone.
Lastly, please accept my invitation that if I can do anything at all for you, please do not hesitate to PM me for a moment. I'm always open to talk.
Please, know I am praying for you, and please keep us updated. We are all here for you.
Prayers, and hugs,
Harley