What Causes Dizziness With Leg And Calf Muscle Weakness?

I get these routine bouts of just feeling unsteady when standing....especially in gym....if im stnading straight ill feel like i can feel my legs....especially if i stand up completely tall......if i sway back and forth i can almost trigger the feeling......I also find myself leaning forward alot...like in the shower....it's almost as if i need stronger calf muscles bc my body tends to want to lean forward.......for the past two years ive been under a tremdeous stress with a divorce......sometimes i think its mental disorder or just stress.....