I seem to be the lone voice in support of chromium picolinate...
I've been taking 200-400mcg/day for years. (Not every day, but at least a few times a week.)
You really have to make an effort to "OD" on chromium, and there's no reason to even approach the levels that would be toxic.
Chromium is required for proper functioning of the insulin receptor, and chromium deficiency mimics some of the hallmarks of metabolic syndrome. (But I think that has more to do with flooding the system with refined CHO and overwhelming what little chromium someone is getting in their diet, than with actually being overtly deficient in it. So it's not that people are deficient in it, but rather that a higher refined sugar diet probably requires more chromium just to handle all the insulin.)
All that being said, if you're already hypoglycemic, chromium is probably not necessary for you, as it seems like the point of taking chromium is the opposite effect -- it's supposed to help lower blood glucose. (And then again, hypoglycemia tends to be a result of too much insulin, so maybe helping your cells to become better able to use insulin would eventually result in normalizing levels and your body wouldn't secrete as much in the first place.) I dunno. It's complicated stuff. I don't think chromium is dangerous at reasonable supplementation levels. Just don't know if it's suitable for you or not.