What Causes Pain In The Legs And Numbness In The Heels?

Dear doctor, I am male 48 years make weighing 105 kgs,i have slight pain in both my legs while i stand,but not when i walk or sit.i have also numbness in both my heels.I had been to an ortho and on taking an MRI the findings are as follows Disc dessication at L4-5, L5-S1 level. Posterocentral disc disc bulge at L2-3 level causing indentation over ventral thecal sac. Diffuse annular disc bulge with posterocentral and posterolateral protrusion at L4-5 level causing indentation over ventral thecal sac,bilateral lateral recess stenosis and moderate to severe effacement of bilateral neural foramina Posterocentral disc protusion at L5-S1 level causing indentation over ventreal thecal sac Doctor has advised me surgery.Is there any other form of treatment to releive me of this problem