Leg Numbness…………..?

My right leg has numbness from top to bottom. About a month ago I stepped on a rock in my bare feet and ever since it feels like I have pressure in that spot, like a rock in my shoe. a few days ago the numbness began. May not be related, I may have
sciatica because of a herniated disk I got about 15 years ago. any excersices I can do to help?