advice needed please!

My son is two weeks old. I'm trying to exclusively breastfeed but I'm concerned I am not producing enough for him. He hasn't been sleeping well And doesn't seem satisfied at every feeding. I can't pump more than an ounce and half a day so I can't even have back up.. it's making me super emotional and stressed which I know can't be helping me in any way. Is this just cluster feeding? Should I try formula? Can I do both?