Sorry, I haven't read all of the replies so someone else might have brought this up, but does the baby sleep in your room? I ask because my daughter slept in our bed until about 8 or 9 months, when we kicked her out for kicking us all night, then in a crib in our room until about twelve months. OH MY GOD, having her in the room with us became a nightmare. It sounds a little like what you're going through now. We moved her into her own room and all sleep issues resolved themselves within three days. She's now sleeping like a champ and has been for months. I guess some babies just need their space.
Also, teething just sucks in general for some babies, as do growth spurts. If those are problems, Orajel and baby massages are my only recommendations. There's not too much else you can do.
Lastly, you mentioned snoring. Has your doctor said anything else about that? Have you tried changing something in the sleep environment recently? Even something innocuous. We didn't realize that we had a humidifier with mold in it until we all got a weird cough which wouldn't go away. Dumped the humidifier and it was gone. So you might check unusual sources of discomfort for your child, beyond the white noise/blocking lights stuff.
My sympathies. Baby sleep problems are the worst, particularly when your child is not only awake all night but crying and screaming at you for hours. People just don't really get how bad it is because they think, "Well, of course my child didn't sleep either," when they're thinking of normal baby sleep patterns rather than the torture you're enduring. Clearly, you're not alone, but I know that probably doesn't help much.