Hi. I know exactly how you feel, the side-effects really are terrible to cope with at times.
I've tried lots of things over the years. A long time ago I went down the medication route to try and reduce my compensatory sweating. These medications include Robinul (also known as Avert and glycopyrrolate), Ditropan, and others. I found some partial success with these for the CS (compensatory sweating), however the side-effects of these meds can be troublesome, e.g. they tend to cause generalised body dryness, so you can get things like dry eyes, dry / sore throat, and difficulty urinating. I therefore stopped them about six or seven years ago, and personally will never go back to them - the cost and side-effects just didn't seem worth it.
However, there are some good prescription-strength anti-perspirants out there. Again I've tried many, but have settled with Odaban. It's one of the few to use a spray (rather than roll-on) and I find this the easiest to use. The worst area of my body for CS is the back, so I use it for this area when I need it. I apply it with one or two sprays onto a cotton pad / cotton wool.
I've tried all kinds of other things over the years, to help reduce the CS and also to help heal / repair the severed nerves, but after recently spending probably close to £1000 on acupuncture and Chinese cupping (and not having seen any positive changes in terms of nerve regeneration) I think I've finally accepted that this is the way it always will be. Therefore I just try to live as healthily as possible. I do tai chi a few times a week at home. This is supposed to be great for all kinds of conditions, including nerve damage and circulation, and whilst doing it I've managed to lose about 20lbs (with the help of the gym and healthier eating and drinking too of course!), so it seems a win-win situation.
I also have a dry body brush as many times a week as possible. This was recommended in a health magazine years ago by a lady who had been through the operation and had the same side-effects that most of us probably do.
I also have a contrast shower daily (again, good for circulation supposedly), and eat chia seeds as omega-3 is recommended for many different conditions. I'm also soon going to start drinking a herbal tea containing many herbs inc fennel and ginger. Fennel was recommended by a fellow ETS patient on another site - he / she said it had really helped them in their hot country (Spain) to help their body cope with the weather. Also, ginger is again good for circulation I've read.
That's about it really. I also love meditative MP3's, self-help books etc to help with the low mood that I sometimes feel when struggling with the side-effects.
Best of luck with everything, and I hope this helps a little.
thank you