Lisa, re your Height problem; I have the same trouble, in fact I have to be careful if I have my shoes soled and heeled, but I have been up in a balloon! It took a lot of courage, but it was a birthday treat for myself and my next-door neighbour, who would not go if I didn't, so I couldn't spoil her day. The balloon takes off like a rocket, once released from it's anchor rope, so you don't have time to be worried on the ascent. The problem is looking down! The simple answer is not to look down! If you look in the direction of travel there is no impression of height, and as there is no wind, very little sensation of movement. It really is a fantastic experience, and quite eerie, and one that, one day, I'd like to repeat.
If ever you get the chance, do it. You'll be OK, and I'm sure you'll enjoy it.Btw, our pilot was Andy Elson, who, I think, was the first man to fly a balloon over Everest, so we were in safe hands!