Can sciatica pain only come when i bend certain ways and when i he up form sitting or laying down pain in lower leg and thigh does not hurt when walk?

Yes: Otherwise called pinched nerve........Positional pain is seen.

Yes: Herniated disks that are cause of sciatica pain typically get worse with sitting, bending at the waist, and definitely worse with bending/twisting and raising a heavy object. Try avoiding these positions/activities initially. Typically most herniated disk pain improves on its own by 3-6 weeks. If still bothering you then i recommend seeing your doctor for further imaging.