I am a big advocate of h202, and other oxygen therapies. I am happy this worked for you and others. I have not had bad sinus infections like it sounds like you have had. When I moved, and started getting allergies to my envirenment, I started to also get sinus infections. Actually it started after my first pregnancy.
I tried several things.. Antibiotics only worked in the shortrun..and then always they came back.
Finally, what I found worked for me, may sound strange. I have a "Bob Beck" electric zapper unit that works on a 9v battery. I think there are references on this site for it. Anyway, I actually stuck the two brass probes, covered with cotton sleeves that were moistened with salt water, into each nostral. Then I turned it on slowly until I can felt the zapping in my nasal passages.
I did it about 5 minutes ...and would repeat 3 more times a day for about 2 days. This has always cured my infections. As soon as I feel one coming, I zap directly inside the nostrals. I move the probes around slightly as I zap. Sometimes I can feel it reacting with a metal retainer I have on the back of my front teeth. That is a weird sensation, but I know it is reallly getting to all areas around there.
If anyone else has a zapper , and tries this, or has tried it, I would love to know how it worked for you.