springlike welcome, sorry you are in so much pain. I don't know that med you are on, not heard of it, is it an anti-inflammatory?
The best combination of meds, depending on issues such as stomach trouble, sensitivities to certain drugs etc for back pain, and from my experience, for disc problems is. Basic - paracetamol + opiate + NSAID. so for example, 1000 paracetamol + 30mg codeine x 4 daily + 500mg ibuprofen x 3 daily. You can take various different mixes of this, so up to 60mg codeine, as low as 15mg codeine. You can take a painkiller that has paracetamol and codeine together such as co-codemol and theses start OTC at 8mg/500mg, and you can get as high as 30mg/500mg of those (can take two). Make sure whenever you take paracetamol, that you are not already taking it in the opiate mix. Other opiates that may be prescribed by the GP are tramadol, dihydrocodiene (usually in the form of co-drydemol), and sometimes stronger meds such as morphine based meds - they are when you have tried other meds and they don't cut it.
So, the idea is to have one of each of those mixes, it's not necessarily about taking the strongest dose, but getting the right level and mix for your pain levels/thresholds/side effect tolerance, and you may find it best to start slowly with certain meds to adjust to the side effects.
But, this may all be irrelevant depending on the meds you are taking already, might replace all of those things.
In addition to this, you can also add to it, for nerve pain/leg pain specifically a nerve blocking painkiller such as - gabapentin, pregabalin (newer/more expensive version of gabapentin), amytriptline. They are all highly effective for nerve pain, they have some side effects which some people find takes a little bit of getting used to, but if you can preservere they may work well for you. The other drugs don't tend to touch the nerve pain, or only a little if they do.
And. if you are having muscle spasms that are difficult to control and making movement impossible, then a muscle relaxant such as diazepam 2-4mg x 3 daily for a couple of days will very likely help ease those spasms and reduce the pain. Sometimes the nerve irritation is made worse by solid spasming muscles and that can ease a little if you address the muscle issues.
And, last but not least for pain relief, if you don't already, use hot water bottles, or heat pads of some kind. We swear by them here, and I currently have a hottie at the base of my back right now.
In addition to all these, as your symptoms are potentially getting worse, and your prolapses are lumbar prolapses, please read the red flags to watch out for relating to Cauda Equina - this is a medical emergency and if you get any of the symptoms relating to this you need to go straight to A&E and it could mean the spinal cord is being trapped by one of the prolapses. It's not common, but you must keep an eye out for the symptoms. I will post a link. And if solid is on, she has been unfortunate enough to have had this so can tell you more about what to look out for.
WOW. long.