Hi Nikki,
I hope you are able to find a paper bag to breath into to get that breathing back to normal. You are going to be fine. Everything you write indicates that the hormones are what you seek and need. I think when we think about taking a step, even if it is right for us, our brains kick into panic mode and cause us to question. I think it is a survival thing. Actually, if you start and think it isn't right for you, you can back away. I kind of doubt that will happen, but you have the option.
As for having gender obsessions the rest of your life, I think the hormones will help with this. It did for me for quite a while. My body dysphoria overrode this after six months. If you don't have much body dysphoria as you said, you should be in good shape. I personally have reached a point in my life where, finally, gender doesn't rule everything. So, I got ta think it is possible for you too. I hope so. Oh, and don't stop telling us what is going on, one occasional poster to another. lol
Moni