Welcome to Healthcare Magic
Since you have neurological symptoms of compression of nerves like leg weakness, it is a necessity to get surgery done to relieve the compression. Laser surgery
is an option which can be enquired into with your Orthopaedician or Neurosurgeon. L5 seems to be causing immediate problem and others are earlier stages which will also cause problem but you need to get Surgery done for sure. Also consult your Doctor about back exercises which can be done to reduce pain and other symptoms. Avoid lifting heavy weights, bending forward, bad posture.