Ohmygosh help, Help, HELP

Good morning!
Hope y'all slept well last night. It seems that we are falling back into some sort of regression as far as sleep goes. So we only say "good morning" here because it is customary and for no other reason obviously...
I don't know what Sam's problem is. Our sink here in the kitchen is divided, so we started using the baby tub in the bathtub, which, heaven forbid, does not fully recline like the sink experience, so Sam has started hating baths that take longer than 14 seconds. And remember when bathtime used to calm him down and get him ready for bed???

NO MORE.
So now he starts getting crabby and wanting to go to bed at 5pm (holy geez) which means that we have to alternate who entertains him for the next hour and a half because all hell breaks loose if you try to put him in his jumperoo or swing instead of holding him and dancing around the room. So once 630 comes around, Steve usually starts his bath while I start dinner, but usually I have to go in there to make sure Steve isn't using hot pokers on him (he doesn't) because Sam screams until his face turns purple... and for no apparent reason. The first night he did it, it scared me to the point of taking his temperature rectally. (That's saying something!) Now I know it's just a sad part of bathtime.

And after Screamfest 2011, it's a race to get the little person lotioned up with a bottle stuck in his pie hole. More screaming. Stick him in the crib with pacifier and mitts to prevent another case of Bloody Baby Head. More screaming, and after a few checks to make sure he's truly not being smothered by anything, he finally goes to sleep.

But the major regression we've experienced is the amount of time that he stays asleep. When he was starting out with the sleep training, the first hunk of sleep would last 5 or sometimes 6 hours straight, with 2 to 3 hour intervals after that until it was time to wake up. Now he will sleep from 7 until 10, and then scream bloody murder on the hour, every hour after that. So while it is a success that he's finally sleeping on his back in his crib, and he's finally coming around to this whole pacifier phenomenon, it BLOWS that we're getting less sleep than before. Most of the time that we go in there because of the crying, his eyes are closed, pacifier in mouth, and nothing else is wrong. WHAT THE H, MAN??? That is especially frustrating.

Steve tried giving him a bottle last night because we figured he was hungry. He would only take an ounce or two (meaning: not hungry AT ALL) and then kept on fussing. We probably listened to him cry from 3am til 630am. Straight. For no reason. Lucky for Steve and me, we can sleep through that kind of thing. And lucky for everyone else, we live in a single family home where we don't have to worry about driving an upstairs neighbor to the brink of insanity with all the incessant fussing.

What are we supposed to do about this?? I can't believe that we are the first ones to experience some sort of sleep regression like this, but at the same time, I wouldn't be at all surprised if we were! We will do literally ANYTHING for some shut-eye around here. Suggestions are more than welcome.