It’s been three days

And my two week old won’t sleep for longer than 20 minutes. As soon as I put him down he cries. Burping isn’t working. I’m nursing every 30 minutes. I tried taking him for a walk but it’s too hot and as soon as I took him out of the car seat he woke up and started crying. I can’t continue sleeping with one eye open with him on my chest. I can’t even make lunch for myself and my oldest because he wants to be held all of the time. I’m just so tired.