I'm not very familiar with these minimally invasive procedures, I had a traditional back surgery several years ago. And quite frankly, I am amazed by how fast people recover from these operations. I had muscle spasms for quite a while after surgery, your muscles are probably tight and guarded. Physical Therapy will help with this, are you going soon?
As far as the pain on the opposite side, that probably from your body compensating, P.T will help with that too.
Take Care