Bad pain in my groin going down my legs comes and goes. i have a herniated disk in lower back and have no injuries as of late to cause a herniations ?

Pinched nerve: Sounds like a pinched nerve to me they can come on for no apparent reason if not better soon then see your doctor.

Sciatica: True sciatica is leg pain that shoots from back, down the leg past the knee. This mimics the path of the sciatic nerve, thus it's name. I presume you have already been evaluated since you have hnp diagnosis. Can be treated non-surgically if not getting worse with mckenzie pt, nsaid's, nerve root injections, and surgery if all else fails. Simple bend/twist causes hnp, trauma not necessary.