Years ago I gave up eating lunch on river trips as I found that any significant exertion right after a sizable meal tended to produce nausea. And if you ever take a bad swim in white water after having a big lunch, you will probably wish you had gone without.
Some people will experience dizziness and/or nausea due to water entering the ear canal. This is more commonly a problem with cold water, but even pool water is cooler than body temperature. If nausea after rolling remains a problem even on an empty stomach, you might want to give ear plugs like Doc's a try: http://www.proplugs.com/
If you can roll a boat that is loose in the hips, you will very likely be able to roll one that is properly padded out. It is possible to brace yourself into a boat without hip pads using your feet and knees to some extent, but there is still going to be some slop when you hip snap. This is especially true for a roll with a rather explosive hip snap (like the C-to-C), less so for a sweep roll or Greenland style roll. Boats used by clubs for pool sessions and clinics are often left unpadded or minimally padded so that they can accommodate paddlers of any size.
Nowadays white water kayaks come with readily or instantly adjustable outfitting. Back in the day, it was necessary to glue in minicell foam padding and carve it and shape it to fit. Nearly all beginning white water kayakers started out with a fit that was too loose for fear of not being able to easily exit, and progressively added more padding when they figured out that they could easily exit even a boat that felt quite tight.
You might be able to roll a loose boat in a still pool, but rolling in current, waves, or highly aerated water is another thing entirely and you want to give yourself as big a margin for success as you can.
Full Size Sail Rig
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