Need to Vent!

Here's the truth. My son is out of control and I'm not sure what to do. Issue #1: We can't get him to stop biting. We've been dealing with this for about 6 months now and he doesn't understand. He will bite so hard that we bleed. We've tried everything (including flicking his mouth, telling him 'NO', showing him through emotion that it hurts. Trevor even bit him back one time.) One particular time I flicked his mouth and told him, "no" and he laughed. Is he too young to understand? Will he eventually grow out of this phase? Issue #2: I am having the hardest time getting him on a sleeping schedule. For the past four nights he's deided that 5 am is wake up time. Then he doesn't want to sleep during the day and by the time 7 pm rolls around he's so exhausted he can't keep his eyes open. Often he'll sleep for about 15 minutes, poop, then scream till I come and change him. Then refuses to go back to sleep. Since he was young I have always let him cry himself to sleep, but now he will stand in his crib and scream for an hour or bang his head or feet on the side of his crib while lying down. We've tried keeping him up later, thinking he'll sleep in more. I've tried scheduled naps where I put him down at a certain time everyday so it becomes a routine. I've tried rocking him, reading him stories, or singing to him before naps, hoping it will calm him down and help him fall asleep more easily. Nothings working! Issue #3: Jonny is extremely attached to his mommy. It is so riduculous that he has to be hanging on to me every minute of the day. If I walk away and he is not physicaclly touching me, he will scream at the top of his lungs. The frustrating part is that he doesn't want to just sit on my lap he wants to walk around everywhere with me holding his hand. Lately he won't even be content with Trevor. It has to be mom! Is this normal? Issua #4: Jonny is always crying. I honestly feel like he has spent the majority of his life cranky. I used to have excuses/ reasons for why he cried so much: 'he's teething', 'he's sick', 'it's just a phase', 'he's just extra tired', etc, etc... I have realized that this is just how he is and has been since he was an infant. Quite often we'll have an entire day spent crying. This last Sunday I woke up at 5 am to a screaming child who did not stop until 7 pm at night when he fell asleep. As you can imagine I spent the day trying to figure out what was wrong. I thought maybe he had an ear infection, maybe his molars are coming in (They're the next to come), or maybe he was just so tired. We missed church, not because of him, but because I was too emotional to go and face anyone. Honestly, these days happen quite often. Please, someone save me! My questions: * Should a 10 month old already be throwing tantrums on an hourly basis? * Is he old enough to understand discipline, or even the word 'no'? * How important is a routine? Should I not worry as much about his schedule and let him do what he wants? * How do I keep my little boy stimulated and distracted during the day so he will forget about crying? * Does anyone know of any good parenting books that might help? * Is all of this normal? * How do I keep from going insane? PS. Just need to add that I love Jonny more than anything. Although few and far between, he does have his happy moments. I am so grateful for him, I'm just feeling lost as to what I should be doing to help him right now!