I've done two or three of those. The only time it made sense was when we made a cape into a colonial. Chances are, you have small rooms downstairs and will add large bedrooms upstairs. You will lose a surprising amount of space to the stairway itself, thus making one of your downstairs rooms even smaller.
If you do an entire rip out the walls remodel of your whole house, you'll probably want to change the location of windows et.c.
Raising the ceilings downstairs more than a few inches would be very difficult and expensive.
My brother in law tried to get me to do a second story on his house. I refused to even talk about it. He hired someone who did a decent job, then he sold the house at a loss and bought another one.
I'm going to have to go along with those who have recommended moving.....Sorry
