What home remedies to cure severe sinus congestion?

It seems like I have tried everything. I keep sinus congestion all the time. Suffer from sinus migranes. It gets way worse when I get a sinus infection. I can hardly breath at all through my nose. At the moment the only thing that really gives me some relief is doing a saline nasal wash with some drops of peroxide. (another something I found.) After doing that, I use an OTC nose spray, which I know is not good to use. Then take a behind the counter decongestant. This is good for a couple of hours. I want to be able to breath clearly, majority of the time and if I have to use anything I would like for it to be all natural. I've been to an ENT and I've had better luck talking to a brick wall. Total waste of time and money. I've tried other natural nose sprays. Oregeno, another one with capisin, just regular saline wash. None worked. If anything, made me feel more congested. Hot showers help a little. I've tried a apple cider vinegar, honey, w/ water tea. Didn't work. Tea Tree oil in nasal wash. Didn't work. I'm grasping at straws here and desperate. I'm just about willing to try anything. I've been working on my posture hoping that might help. Trying to cut out sugar in my diet. Does anyone have any other suggestions?