I feel pity for you that at this age of 30 you have bad so many problems including replacement of knees which shows either you had a ruined lifestyle or inherited some diseases or complete neglect of timely medical advise. What ever the cause, now that damage is done, no use of crying over split milk. Let's try to find out the solution.
The treatment you are taking for pain is only temporarily managing pain that too with potential side effects. It would not either cure your
migraine or back to leg pains.
You have taken best in
allopathic medicine and you know the effect your body had. Would you mentally prepare yourself for some alternative way. May be it doesn't cover in your insurance. But will not be expensive either.
If you agree then initially try to do some deep
breathing exercise. Initially 5 minutes raising to 15 minutes in a week's time or so. Simultaneously start simple Yoga postures for 10 - 30 minutes as you mature. Learn through YouTube or physically. From day one start taking mild herbal laxative Tarunikusumakar Chooran ( not commonly found in Europe, USA). Otherwise commonly found
Triphala capsules will do.
Your
back pain is because of compression over
nerve emanating from lumbo sacral region and supplying to leg/s.
Arthritis, IVD osteophytes ( generally not at this age), IVD space reduction( various reasons)...whatever Rumalya forte tablet and Liquid Dashmularishta is the answer. These will lower migraine episodes too. For migraine specially, additional Shadbindu oil and Almond oil drops should be installed in both nostrils ( former is very pungent). But please see all above exercises and medicine are totally harmless. No side effects. But SLOW. These are non synthetic non toxic. In about 8 weeks you will feel much relief that you would not leave it midway. Yes, if you want other procedures and med too, no counteraction with these herbals. Give some reasonable gap while taking orally. Drink warm water with herbal med in large qtys.
May seek the help of any available Ayurveda doctor or keep in touch through HCM. HCM wants to see you happy again.
Hope it will help you.