Achilles Tendonitis

For the last year or so, I’ve been suffering from serious pain in my Achilles tendon anytime I run or walk at a fast pace. I’ve been to a podiatrist, whose only advice after x-rays and several appointments was to stay off my feet and wear a boot to bed. Isn’t there anything more I can do, or am I doomed to sit on the sidelines at the ripe old age of 37?