You are going through a lot of emotion right now. Your partner is not supportive and going on HRT is frightening.
A gender therapist, a support group and friends from the group will help you realize you are not alone others have been where you are now.
What Cindy shared is important and worth rereading.
Quote
I also recall his words to me years later over a coffee, I asked him when he knew I was trans*, his reply "When you walked into my office, there was no other reason for you to be there, you just needed a way to accept it"
Being honest with your practitioner is a best practice. So lets recap, you need to transition, have a script, got into an argument over transitioning and tossed the pills in the toilet. Why? If you had a supportive partner would you have tossed the pills? You are human and trying to appease everyone but yourself and you are living a hell. You know the way out, now you need to trust in yourself and do what you need to do.