Hi, I'm new here. Short description of history, then my question.

I had XLIF procedure done with fusion of L4/L5 on Deceraber 22, 2010. I did not have a bone graft, dr. used synthetic bone. He went in through my right side. About a week or two after surgery I started having a lot of pain in my right groin area, along with hip pain. I can't even stand up straight or walk without being on my toes. My right leg won't straighten out. I had my post op visit yesterday and he said everything looks normal for 4 weeks out.
He told me to rest and not to be up walking, other than household chores, which I can't even do. From what I have researched, it sounRAB like the PSOAS muscle. Does this EVER heal? Even after time, I just want to know if I have something to look forward to.
My question is, should I rest it or try to walk as much as I can? If it is a contracted PSOAS, shouldn't I stretch it out? If so, why would he tell me to rest it? Today has been bad, but yesterday and the day before it hasn't been as bad. I went to the store two days ago to try to walk around and it seemed to help a little, but today it's just bad. Sitting down doesn't bother me at all, only walking and trying to spread my right let out. It also hurts some on the left, but nothing like the right muscle.
Also, I was on Hydrocodone 10 and Soma, but he said I don't have to take the Soma anymore and lowered the Hydrocodone to 5mg, which I have only taken one of today. I've just been aying around and sitting up.
Any advice is greatly appreciated.