(1) I had an epiphany about what my life might actually be like a few years from now, if I don't set my priorities.
(2) I had an epiphany about what my life may actually be like a few years from now, if I don't set my priorities.
(3) I had an epiphany about what my life might actually be like a few years from now, if I didn't set my priorities.
Let's say the epiphany the speaker is talking about, the speaker had earlier today. Having said that, which of the above sentences are grammatically correct, and what's the difference in their meaning?