Lumbar Spine Problems: L1/2,L3/4,L4/5,L5/S1 Degnerative Disc Disease

About ten years ago, I had two operations to relieve nerve pressure on my nerve to my right leg, about two years apart.  However, now ten years post op, a recent MRI revealed the following:

1. Total loss of intervertebral disc space at L4/5/S1 consistent with advanced degenerative disease. Loss of T2 signal consistent with disc desiccatiion is seen elsewhere. Conus is at T12/L1.

2. L1/2. Mild posterior disc bulge. No central canal or neural foraminal stenosis.

3. L2/3 Mild posterior disc bulge and moderate bilateral facet joint osteoarthritis. These result in mild bilateral neural foraminal stenosis and mild central canal stenosis.

4. L3/4 Mild posterior disc bulge and mild bilateral faced osteoarthrities. These reult in mild bilateral neural foraminal stenosis and moderate central canal stenosis.

5. L4/5 Post surgical changes of right hemilamectomy are noted. There is a large posterior disc osteophyte complex which extends into the right neural foramen. Also moderate bilateral facet osteoarthritis. The above result in severe right neural foraminal stenosis and moderate central canal stenosis.

6. L5/S Postsurgical changes of right hemilaminectomy are noted. A posterior disc osteophyte comlex extends into both neural foramina. There is also moderate bilateral facet osteoarthritis. The above results in moderate bilateral neural framinal stenosis, but no central canal stenosis.

Opinion: Diffuse lumbar degenerative disc disease which is severe at L4/5/S1.Multiple lumbar neural foraminal and central anal stenosis as described above. Old mild compressiion deformity at L1.

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I am 65, male. Presently I am encountering low back pain which is relieved when I am sitting. I am unable to stand for longer than a brief short time before my back gets very VERY tired and I must sit down.  Also, I have intermittent pain to the back of my left leg which is transitory.

WHAT CAN I DO?  WHAT IS RECOMMENDED?  Any help and suggestions would be appreciated.  Thanks.