How Can Severe Pain In The Calf Be Treated?

I have very bad calf pain. I have had this for 10 years. It startef off as a very slight pain in late afternoon. Then as years went on, the intensity increased and I would feel it all afternoon. Now it has increased to the point that my pain is constant and gets worse with walking. Activities such as gardening leave me very fatigued and I have to quit. An okd NRI told the doctor that it was in my back. But it doesn t hurt me there and it never has. And the pain gets worse. I did have a blood clot test that showed nothing, but that was 10 years ago. I did have physical therapy, acupuncture, cold laser, nothing helps and now my things that I used to do are getting very difficult. I also had a sonogram by a vein doctor which showed nothing 10 years ago.