Hi OP,
I was in the same boat a few years ago when I almost *gasp* decided to go through with the ETS surgery. Then I met this friend who told me that his friend has done it and the compensatory sweating is even worse. I backed out at the last minute. I went on to try different things including ionto, antiperspirant, and finally botox. My point is, there are defintely options out there and I suggest you to try all of them before you go through with it.
It's a life long decision, so why not take a few month to try different products or a combination of them before doing it. I know that ionto won't work for facial sweating. However, have you tried the following:
1)Antiperspirant, esp. Hydrosal gel, Megadry, and Drysol or a combination.
2)Botox- it worked really well for me
3)Oral Medication- definitely worth looking into before doing the surgery
4)Depending on where you live, I think some doctors are also trying laser surgery to destroy the sweat glands
Also, I found this website to be somewhat helpful:
SweatManagement - Home
Anyways, it is a really big decsion, I hope you think through it rationally and consider all your options before going through with it. GOOD LUCK and ALL THE BEST.