I've been stumbling when I salk right foot been exercising it to no avail getting worse, have to be very careful when walking.

This . This should be taken seriously. Stumbling while walking can be a sign of a more serious neurological issue; inner ear issue; deformity, arthritis or nerve damage of the affected foot. You need to schedule a visit with your primary care provider for a complete history, physical, and diagnostic tests as deemed necessary. I wish you well.