Hey khigh! Not sure if you're going to still be reading this but I figured I'd post about my experience in the hopes it helps.
Two years ago I applied for Ph.Ds for the first time, though it was in a different discipline. I didn't have a high enough GRE Quant score (it's all about numbers there), and after a particularly long and drawn out applications cycle I didn't get into anywhere accept for 1 masters program I applied to as a fluke. A year into that program and I realized that the other discipline wasn't really for me and decided to go back to history, something I always loved but was advised against because of the job market (as I'm sure we all have). Yet again I was rejected from every single Ph.D program I applied to, getting into yet another masters program. Please understand when I say I know EXACTLY how you feel getting rejected from every place you've applied to. I had that same feeling again when Penn sent out interview requests a few weeks ago and I didn't get one.
I tell you this, and post it here instead of doing a PM, in the hopes that others who are in a similar position to where I was to know that many others also know what this feels like. That being said, I humbly offer the following pieces of advice:
1) Get off Gradcafe: I'm saying this for your sake. You need to get away from this environment and the constant reminder. At this point it may have become a habit, checking your email every 15 minutes and Gradcafe every half hour, but no matter how good your intentions are, seeing other people getting into programs just twists that knife. You can certainly come back! The advice on this thread really is useful and it's great meeting people who understand what going through a cycle is like, but you need time for you right now.
2) Treat yourself: Go see a baseball game (do they have baseball games now? Idk), get a nice dinner, watch RuPaul's Drag Race, do something you've always wanted to do, surround yourself with friends and family. Even the smallest of things can make a big difference.
3) Let some time pass, maybe a week or maybe two, but give yourself time. Then start reaching back out to POIs and see where you went wrong.
I think that at this point of the application season tensions are running a bit high, and it's easy to forget that we're all going through this together. Hopefully this helps!