Giulia- It's not THAT terrible. As a person with a completely dead left ear since I was four years old, being able to have the option to hear again is actually a wonderful thing. The surgery and initial recovery period, IMO, is worth it considering it's an FDA approved device that has helped thousands.
I'm considering my decision carefully, weighing all sorts of pros and cons including upcoming technology. I'm 99.9% certain I'll be going for a CI for my left ear within the next 6 months.
I'm lucky that I didn't have Meniere's disease on the level that candy does. I can't imagine how much of a pain that is to endure. I have, however, had the SEVERE debilitating vertigo that I have grown out of (thank goodness). I'd be bedridden for 2 weeks at a time multiple times per year during elementary school because my vertigo was so horrible.