Good to hear from you, sorry things haven't improved.
I know it's hard to keep doing things when they aren't reciprocated. But do you think that they are the right thing to do? If so, then keep doing them. Tell me this: if you asked your W to recall the highlights of your 15th anniversary trip, could she? I'll bet she remembers more about it than even you do, only the highlights may be a little different. You can also bring up the trip in conversation, not fishing for compliments on all the effort you went through, but just to remind her that you did it. Who knows? It might resonate.
If I may make yet another analogy: Scientists know that earthquakes are caused by buildup of pressure on two sides of a fault line. When the pressure is sufficient: Earthquake! You want the earth to move. Keep applying the pressure!
