I am having an Orbera placed next week. Will I be able to ride a roller coaster while I have it?

Absolutely. It takes most people 3-7 days to adjust to the balloon, and to get over the initial nausea. After that, you may have an additional week or so of lingering nausea, but it is much milder. By 3 weeks post-placement, you should be feeling great and will be able to do whatever you like -- rollercoasters included.