It is an ongoing issue, I'm not sure much can be done (surgically or medication) other than what you already do to alleviate the pain. But I'm no Dr, nor do I suffer from sciatica pain.

That stuff is expensive, trust me, I understand the apprehension. I hate buying things that don't work, and you can't return. Take some time to look around for a good shop though. As around your local area (or just outside your local area) and see how good reviews are, how helpful/knowledgeable staff is, etc.

As I said previously (in different words lol), any smart shop owner/employee would want to keep customers coming back, so they should be able to recommend something worth buying.

One thing I didnt say, keep in mind that each and every one of us is different. What works for some may not work for you. An alternate approach, you could consult with your doctor to see if s/he has any recommendations for you. Make sure to mention this incident and it is preventing you from work.