I Have Been Experiencing Intermittent Tingling In My Right Foot.

I have been experiencing intermittent tingling in my right foot. The tingling originally started in my toes and now is gradually spreading to my feet. This has been going on for about 2 weeks and is gradually getting worse. I have a healthy diet and I go to the gym every day, so I am unsure of what might be going on. I don't have any back pain either. I do seem to become fatigued more easily than usual and have not been sleeping very well (though I usually don't). Any suggestions would be helpful. Thank you.

Sarah