from oversupply to not enough?

miniray

I normally feed LO only 1 breast per feeding due to a fast letdown and slight oversuppply. The past couple days he's not satisfied after one breast. Last night dh gave him a bottle (2.6oz) just to get him used to the bottle and he was still hungry after so I put him on the breast for 16 minutes until he finally fell asleep. Then I pumped to try and replace the bottle's worth and I only got 0.5oz. I normally feed him one breast and pump the other after first morning feed and get about 2oz and this morning I barely got 1oz. Im feeding him now and he sucked the first breast dry and was getting frustrated so I had to give him the second and he's chugging away. Am I loosing my supply? Is he drinking more? What should/can I do?