Your symptoms of buttock and leg pain/weakness sound consistent with the disc bulging at L4-5-S1. This certainly could be
sciatica, or a problem along the nerves from the L4-5-S1 roots. The groin pain is more consistent with the problems at L1-2. Consider seeing a neurologist for a formal neruological exam. ALso, an EMG would be helpful in looking at the extent of nerve injury. We usually recommmend light physical therapy (some recommend rest), anti-inflammatory agents such as ibuprofen or tylenol, and no heavy lifting. If the symptoms progress with bowel and bladder involvement, or the degree of disc herniation is severe on MRI and EMG, then surgery may be the option for you. Start with the neurologist who can help point you int he right direction. good luck
Also, maybe when your bladder or colon is full, it puts more pressure on the nerve & disc.
I heard they now have some pretty non-evasive surgery techniques to repair herniated discs. The Laminectomy operation felt like someone beat me on the back with a baseball bat for a couple weeks afterward.
Good luck to you.