I had herniated discs and developing (so far) a mild case of sciatica which often goes along with the pain of herniated discs. I want to nip this in the bud as I remember having an awful case of sciatica years ago which I believe lasted close to one year.
Right now I am using heat to the area, going to PT and doing just short walks on my treadmill. Cold applied to the area can also be helpful - find out which is better for you.
As far as exercises, there are lots you can do and actually MUST do to help alleviate the pain. They are really simple stretches. Google sciatica and lots will pop up including pictures of exercises. Start out slow but keep it up. Consistency is the key. And remember, anyone with back pain or a history of back pain really must do back exercises the rest of their life to avoid episodes. Once stabilized, just a few a day is good...you can even do them upon awakening in bed. Good luck.