Lower back hurts and swollen feet ankles and calves and can't walk far?

Need to see doctor. You need to find out why you are getting swollen lower extremities. The back pain may give a clue as to where to look, but there may be other reasons as well. You must see a physician. Goodluck.
2 separate problems. I can't think of 1 disease that would cause both problems. The swelling sounds more ominous - it can be due to kidney, heart or liver disease and needs investigation.