I'd be more likely to do it if I knew it wasn't real. If you thought it was real you'd have to leave this life behind, and despite all it's imperfections this life is pretty fucking amazing.

I think that substantial happiness comes from real things so I would choose this life, the truth. I've spent a periods of my life depressed and smoking lot's of weed to counter the facts. It kind of works in a way, at the time, but you always come back to reality in the end(even when doing this it was always real things that brought substantial happiness, drugs were just a way for me to get out of my mindset, to let go, so I could focus on the moment at hand).

As to the second question I would do that. It would be like getting an extra month of life from a different perspective with no downside. If you can't remember it than it wouldn't make this life seem any worse in comparison.