Please help im so stressed atm

Try not to worry. Burgers/pizza while higher in fat still have carbs, protein, dairy/calcium, some veg and fibre depending what you get.

Try and take your pre natal vitamins the next few days where you can and make some home made meals (even a homemade burger if you fancy one!)
Did your diet effect you much in other ways, like gestational diabetes or more then expected weight gain? I’m sure your midwives would have said if they were worried about anything.
Presume they would have said if anything was noticed at your scans as well :)
So easy to over think and worry and easy to say what we should have down when tiredness, cravings, food aversions, morning sickness can all play a role.
I’m sure all will go well. Best of luck with your c-section and hope you have a healthy baby :) x