The difference between Multiple Sclerosis and ALS disease

The difference between Multiple Sclerosis and ALS disease: http://www.webmd.com/multiple-sclerosis/ms-or-als  I have progressive MS and was supposed to have a steady decline, but i have a half paralyzed leg, back pain, real bad back pain and fatigue but every day i am thankful that i am not getting worse...yet, i love being retired and writing my books and short stories. My beloved mate supports me when i need it, my family and friends are there for me. What more could a person ask for?