Sorry to hear about your pain, "bonnie." I've been in your situation for the past 15-20 years. Your complaints about Fentanyl are common. Temperature changes occur. The patch seems to last about 48 hours, not 72 hours. But I would disagree about your complains concerning "ups and downs." Because Fentanyl Transdermal maintains peak plasma level for at least 48 hours, it is the most consistent of all pain medications. "Ups and downs" are associated with short-acting drugs. But, everyone is different and the trick is to find the combination of drugs that work best for each of us.
You made no mention of a breakthrough medication. Most of us with chronic severe pain also use a short-acting narcotic (Hydrocodone, Oxycodone, Fentora, etc.) for breakthrough pain. Have you asked your doctor about a breakthrough drug?
You mentioned Elavil as having "no good or bad reaction." It is an axiom that chronic pain patients benefit from using an anti-depressant. Anti-depressants inhibit the reuptake a Seratonin in the bloodstream. Seratonin is one of the body's natural pain-fighting chemicals. Have you tried Cymbalta? It is a fairly new anti-depressant with pain-fighting qualities.
You mentioned fibro. Have you discussed using an anti-convulsant with your doctor? Anti-convulsant medications (Neurontin, Lyrica, etc.) have benefit for neuropathic pain and fibromyalgia. Combined with the medications listed above, it represents a valuable arsenal in pain management.
You also did not mention going to a comprehensive pain management program. There are literally dozens of non-invasive and marginally-invasive treatments available at a comprehensive pain management program, including: corset, brace, TENS, traction, acupuncture, biofeedback, physical therapy, kinesiotherapy, injection of steroids and anesthetics, non-steroidal anti-inflammatories, cortisone, rhyzotomy (radio frequency denervation), spinal cord stimulator, intrathecal infusion pump, off-label medications (anti-depressants, anti-convulsants), combination of long-acting pain medication with breakthrough meds, counseling, hypnosis and meditation. I can drop my pain by 20% with biofeedback alone. Many people rave about acupuncture, hypnosis, kinesiotherapy, etc. I understand your reluctance to stop all of your medications. However, not all programs require that, once you've explained what you've already tried.
I can sympathize about your search for a physician who would also be willing to prescribe your large dosages of narcotics. Unfortunately, many contemporary physicians are more motivated by fear of the DEA than by reducing their patient's pain.
Have you considered psychotherapy? Our condition is depressing. It would be normal to need help.
Finally, if your pain is as bad as it sounds, have you discussed surgery with your doctor? I know that the success rates are low (40-60%) and some patients are not surgical candidates. You might want to request a referral to a spine surgeon (an orthopedic and neurosurgeon with a fellowship in spine surgery). It can't hurt to hear from the expert's expert. Good luck.