Can't breastfeed.. feel like a failure

My son was in the NICU for 2 weeks. I pumped since day 1. First every 4 hours and it worked fine. I had a great supply. After I got discharged my supply kept decreasing. I drank a lot of the tea they recommend, massaged my boobs, ate all milk boosting foods, started pumping every 2 hours..And tried to get him to latch. nothing worked.. My supply is now completely dry and I feel like I failed as a mother already. :(