Extreme foot odor all my life. Dr. Prescribed hyper care at night and clindamycin phosphate for morning. Hasn't helped at all. What's next?

Antifungals. If your feet sweat, you need to wear white cotton socks, apply powder in your shoes, and use some kind of antifungal cream.
Change shoes, etc. Foot odor is usually related to a combination of excess perspiration combined with bacterial overgrowth which is re-contaminated by residual bacteria in socks and shoes. You can soak feet daily in 10% clorox bleach solution, use an antiperspirant such as drysol, get socks that are treated to retard odor and change often, and get rid of your old stinky shoes.