I'm sorry you're so uncomfortable with the Bravo. You're not alone. Others who have posted here have been extremely frustrated and uncomfortable while it stayed attached.
While I never had the Bravo, but rather had the wired PH probe, I've read many, many posts here describing the experience.
It appears that the length of stay is very individual. You'll want it to stay in at least two days, so you have a chance to collect the important information that your doctors are looking for.
Once you've had it in long enough to provide the data that is required, some people find that they can help it off by eating things like bread...that drag on it and make it more likely to come loose.
One person here had it taken out after several days, although was warned that it could create a painful ulcer if pulled off too soon. As I said, some people are never bothered by the capsule, while others find it unbearable.
I'm sure that others will be by to share their own experiences with the Bravo capsule/PH test.
Hang in there!