Hello, and I'm sorry to hear about your issues, back problems can become very complicated very fast.
Unfortunately after that many back surgeries you are most likely going to deal with some degree of pain for the rest of your life. My main suggestion with such an extensive history, would be to find a physician in your area that specializes in "physical medicine and rehabilitation". These are physicians who are trained to deal with chronic pain issues and complicated courses such as yours. They specialize in diagnosing and treating musculoskeletal and neurological disorders.
As far as medication, it seems like you are on the right track, but you may require some degree of pain medication for awhile so you can get through the pain on your way to recovery. I would also suggest pursuing physical therapy at a reputable location near you. They will hopefully be able to help strengthen your abs/core/ and back muscles to help support yourself better and take the strain off of the discs and hence the nerves.
I'm sorry I can't give you a cure-all, but as I'm sure you know you're in a bit of a difficult situation that will require some long-term following and rehabilitation. So start by finding a PM&R doctor that you work well with and best of luck getting back to enjoying your beautiful country. Let me know if I can expand on anything or can help you further...
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Please note that answers are for information only, do not take the place of an assessment by your doctor, and does not establish a patient-physician relationship