Just to be certain, is it the same as "You might have nobody to help you"?
"Nobody might help you" means it might happen that no one would step forward to help. The emphasis is on the reluctance of potential helpers.
Your suggested paraphrase stresses the idea that you may be isolated, so that there would be no potential helpers present. Using "you might have" brings in the connotation of "what you have on hand" -- in this case, not having any helpers on hand.