I think it sounds like a relationship issue, where someone was pretending to be in love with you, but the one thing that struck you "shakes off your disguise" and "faux sun falling" might represent the sun as the good things you experienced, and realizing it was all a lie and watching it fall in front of you. "It's over, it's gone" and "Where is the sun? Has it set?" "What is? and what is not?" Or, what's real, and whats fake, i can't tell!
That's my take on it.
I think it sounds like a relationship issue, where someone was pretending to be in love with you, but the one thing that struck you "shakes off your disguise" and "faux sun falling" might represent the sun as the good things you experienced, and realizing it was all a lie and watching it fall in front of you. "It's over, it's gone" and "Where is the sun? Has it set?" "What is? and what is not?" Or, what's real, and whats fake, i can't tell! That's my take on it.