At this point, I would cut off the bloom shoot, you don't have enough plant left to support it and the new growth you need. Speaking of dark/black stuff under the leaves sounds like it got too wet and rot or fungus started up. It looks clean at the moment, so give it new media in a smallish pot and let it rest again. It can be hard to get the culture down right, but once you figure it out, your plant should do well.
It's possible that your new place is moister or has less air movement and what was the right amount of water at the old one was too much at the new. It's also possible your media was old and breaking down and damaging roots. The good news is that you have roots, but you need more of them. You said you got it 1.5 years ago, depending on circumstances (I'm going to have to guess of course) that might be long enough to need repotting, esp. if the media is fine rather than coarse. You mention using a spray bottle to feed your plant - orchids don't take foliar feeding particularly and should be fed in their normal water with a very dilute fertilizer.
As for repotting - if you use too large a pot, it won't dry evenly or quickly and could stay wet in the middle and rot your remaining leaves. Use a pot small enough to crowd your roots a bit and go easy on the water. Keep it warm, Phals like warm roots and good air to the roots. You should be able to bring it around pretty easily.
So sorry it didn't bloom for you, but at least it tried! It's going to need 4 - 5 leaves before its ready to bloom again, but once you get the hang of it, it should bloom most years for you.