Intrathecal pump symptoms and conditions

I am a forty something year young female that has been on fentanyl now for approximately two weeks. I am approx. 85% pain free for the first time in about 5 years. Unlike the other postees, after 12 back surgeries, including the introduction of a spinal cord stimulator; I recently had a intrathecal pump implanted. Since the original implant, I have had three separate medications used, (morphine, dyladid and now fentanyl). With the pump, the medication is dispensed directly into the spinal canal requiring a minimal amount of medication, versus taking it orally or being absorbed into the skin through a patch. With the medication going directly to the spinal canal, it does not have to go through the other internal organs before reaching the pain site or nerves, thus minimizing the side effects. Do I have side effects? Yes, but they are minimal and I am very pleased thus far with the results. Where as some patients are receiving anywhere from 70 - 100 mg. in the patch over a three day period; I receive 80 mg. over a 42 day period. It is highly concentrated and again, does not have to be absorbed through my stomach, kidneys, liver, etc. before reaching the pain site. When the pump administers the drug, 100% reaches the pain site; where as out of the 100 mg received orally or through the patch, less than half of that reaches it destination. So far, this is the best I've felt in years. I can walk, sit up and play with my dogs for the first time in years.