A couple of years ago we were rear-ended at freeway speeds and as a result my wife’s back was royally messed up. We’ve seen at least a dozen doctors locally, and the best anybody has been able to do so far is load her up with a handful of meds a couple of times a day (which still keeps her in...
The price and description sounds like the VT-52, which is what I have. If so, its not a thermo-electric.
That said, I've had great luck with mine, but our house is always between 68-75 so it doesn't cycle very often. I've also got 2.5lbs of beads.
My first post or so was a pretty similar lightweight experience... here's the link, you're not alone :)
One of the last couple of posts is a pretty good summary of the advice I was given. One thing I'd add, is don't over exert yourself...