I am so sorry. I know how stressed out you are. I found out DD was breech at 36 weeks, and I freaked out. I think there are a few things you can do to prepare yourself that would really help out:
is a great resource for ways to spin babies. None of it worked for me, but that doesnt mean it wont work for you. No harm in trying if you are going to sit around stressed out anyway
Go see a chiropractor that specializes in pregnancy or is familiar with the Webster technique.
Ask your doctors about an ECV (version). The success rate is a little higher than 50%. I had a successful version and it is what kept me from having a section (I live in a place where breech babies are not delivered vaginally in the hospital). Mine was pretty painless, took less than 90 seconds, and was basically two doctors placing their hands on the outside of my belly and swiftly turning DD around to head down.
Familiarize yourself with the options you have during a section. There are lots of ladies here who have had cbirths who can better inform you, but I know one of the scariest things for me last time was the idea of facing a section when I wanted a natural birth. The number one reason I was so scared was because I was uneducated about the process of a c section and the options I had. This time, I researched a lot about sections and if something were to happen that would put me in a situation where I needed one, I am much more comfortable with it now that I know way more about it.
Again, I know how disappointing it can be to see your natural childbirth dream slipping away from you, but it really is best to not stress yourself out too much about it. What really matters is that the baby is delivered safely and you are ok, right? I know it's hard to think like that in the moment, but try hard not to let the stress of the baby being breech keep you from enjoying your last couple of weeks of pregnancy. You are gonna be a momma soon, one way or another!
Maybe another mama who has vaginally delivered a breech babe could chime in with some info about that. I dont know very much about it, but I know folks do it all the time!