Hi Bazwaldo - i have moved your post to a new post and referenced the post you originally posted on...

the answer to your questions is..."yes"
+ talk to your physio about the recovery and ask/tell them you are thinking of a second opinion because recovery is slow. Also ask if there are other options, scans etc that can be done. It sounds like your physio has decided to use a Mackenzie approach to your problem but it isn't the only way.
+ you are recovering so the answer may still be that you need to wait a little longer.

Other problems include the way you might be standing and sitting (posture), your pain might be because of a disc but there might be something making your disc sore (like a Wikipedia reference-linkSIJ not accepting load properly and so stressing your disc) etc etc.

How are you finding the exercises? Do you feel better for doing them? 6-8 weeks is a normal recovery time for most back pains to get better on their own...

Cheers