I agree, it's probably not caused from snowboarding, but snowboarding will certainly not help it heal. I would take a little time off, I know that's not what you want to hear, but a little time off now could save you from a much worse injury later. Trust me, it's worth it.
When you get back to it, think about your stance as you ride, and try to notice how your legs feel while strapped in. If it hurts, or feels funny, adjust the stance. That could help, you never know.