Running goalposts

Well, yes I am slack, or to be more precise, just very very busy. I wish I could devote all my waking hours to this study, but unfortuately I have to earn money as well, and as PhD scholarships fall well below the poverty line, I need to supplement my income. I am after all the main breadwinner in this equation.
I have to get on it however. Each time I meet with Andy, it feels like the goalposts move. I go down one path and I have to do more and more and more just to satisfy what needs doing.
I think this is why I lose motivation. I'm doing what I think I want to do then I have energy and commitment, then it all gets shifted. I feel like I'm walking on sand.