Re: Is Dinghy sailing for me?
With what you describe, I'd think real "body english" boats (eg Laser) where you leg-hike a lot may not be for you unless the cramping condition gets better.
But no reason you couldn't sail on something larger where your physical positioning is less critical. So we're talking maybe at least, what, maybe 20 times your own weight? Say 3000 pound boat for 150-pound you? That may take some of the anxiety away compared to a laser where you and the boat weigh the same.
You also should discuss your plans with your doctor, if you haven't yet. But there's got to be a way for this to work out for you, I'd think.