Help! Black spots not responding to fungicide (photo)

[Orchidreamer]

I bought this catt a month ago, and it had some small brown spots at first. I didn't think too much about them, but now, the spots have gotten out of hand, and they've "grouped" together into brown patches.

I treated with hydrogen peroxide. That didn't work, so I treated with an organic fungicide from HD. That didn't work, so now I'm using Daconil. It looks like the spots are appearing on a few other leaves too, even though I've been applying fungicide to almost all the leaves.

I've cut off a few other leaf tips and applied cinnamon, but the cut area is beginning to brown (maybe the fungus got there too?). Now I feel nervous about cutting leaves.