Urgent help needed!! Update

I have been exclusively breastfeeding for 6 months now. My breastmilk supply seemed a little off this last month. It has now been a week and my breasts feel super soft. I feel like my baby is not making any swallows particularly in the evening and before bed. I got worried and pumped in the late evening to see if there was any milk at all. Well, I only got drops. I pumped again during the day and got about 2 ounces. Long story short, My breast do not feel the way they used to. They seem some what heavy at night and the morning but absolutely floppy during the evenings. His pees have reduced from about 8 a day to about 5. My son latches and then leaves because he was so used to a good let down. I had always felt my letdown but stopped feeling it since last week too. He refuses bottles and spits out formula. I am so worried. Any advice?? Please help!!

UPDATE: thanks for the replies ladies. I just wanted to let you and anyone who is in the same boat know that my supply improved after a week of the issue. It stayed up for about 3 days and is somewhat less today again. I think it is because he is again feeding less. But I feel more relaxed now knowing that things improved once and can improve again.