I'm very sorry to hear about your terrifying experiences with chronic pain. Mine has been going on for almost 40 years.
Most spine surgery carries a long-term (12 months) success rate of about 60%. That's one of the lowest success rates for all types of surgery.
You mentioned trying the IT pump and the spinal cord stimulator (SCS). Yet those are the last two treatments that should be attempted at a comprehensive pain management program. The others to try first include: spinal decompression, corset, brace, TENS, traction, acupuncture, biofeedback, physical therapy, kinesiotherapy, injection of steroids and anesthetics, non-steroidal anti-inflammatories, cortisone, rhyzotomy (radio frequency denervation), off-label medications (anti-depressants, anti-convulsants), combination of long-acting pain medication with breakthrough meds, counseling, hypnosis and meditation. If all of those fail, then you can try the IT pump or the SCS. The reason to delay them is because surgery is required to implant and to remove these mechanical devices and all surgery entails some morbidity risk. Some chronic pain patients have succumbed to MRSA infections related to implantation. In fact, some of the less risky treatments are very helpful. For example, I can reduce my pain by about 20% at any time with biofeedback alone. Some people find acupuncture useful. Even hypnosis can help.
Knowledge is power. The most important thing in your life is your health. I was too eager to have spine surgery and it failed four times, including multilevel fusion. Now, the surgical fibrosis (scar tissue) creates even more pain.
I hope that you can find some measure of relief from your pain. Meanwhile, here is the most comprehenisve, detailed report on all major spinal interventions:
http://www.painphysicianjournal.com/2009/july/2009;12;699-802.pdf . I hope that you find it useful.