I’m nervous!

Long story short I opted at the beginning of my pregnancy to go with a repeat c section. My middle child was delivered via c section because he wasn’t moving at all. I really wanted to try natural one more time because I decided to also tie my tubes after this delivery. So I just wanted to experience the whole thing again like with my first. I’ve been having spinning headaches for about a month now that make me so nauseous I can’t function. I’m 35 weeks and 3 days now. Last Wednesday I was told my babygirl is breech. That doesn’t matter much but today my headache became a migraine and I vomited. I couldn’t really eat today but kept drinking water. As I layed there I started crying and getting anxiety thinking about another c section and the surgery just being longer then my last because I would be doing my tubes while I’m open. I have been having this fear of something going wrong. When I was given the spinal tap before surgery with my middle child all I could remember feeling was my heart racing and I thought my heartbeat was dropping. I’m not ready for this. Now I’m at the point to ask my dr what the chances are to try turning my baby so I can just try natural. I’m 2cm dilated already and this past Friday I started loosing my plug. What are my chances mamas to change my delivery option? I’m so nervous and scared I keep crying all night because I’m just scared of the worst happening to me