Could anything else go wrong 😔😔

Today I am 29 weeks and 2 days and I found out about 2 weeks ago I am borderline on Gestational diabetes but they are gonna have me on a diabetic diet As well as testing my blood 4 times A-day. We found out at 23 weeks that I had a low lying placenta or known as placenta previa which they checked today and told me instead of it moving up it is moving down and that my son is already head down and I am going to be having a c section. I literally became distraught about having to have a c section as this being my last baby I wanted to have him vaginally as well. We have has the worst time with this pregnancy over my two girls and my one miscarriage right before this pregnancy. I just am so sad and upset I want to just cry..... I dont know how I should feel or what I should do. Please help!!