I think every first time mum has been through that stage and its not a happy place. Our DD got extremely clingy to due to hospital dramas (hip dislocation) and that her not wanting me out of her sight. It was extremely draining and at times i just wanted my old life back which sounds horrible but thats how depressed and sleep deprived you get hey. And those thoughts only make you human, not a bad mother.

We ended up going to a sleep and settling class. It was a one on one with the councilor and she advised us what to do. Well me actually because there was no way DD would let DH put her to bed.
I to could not leave DD side when putting her to bed. I used to have to sneek the boob out of her mouth and hope to god she didnt hear the release other wise she would start crying and id have to put her on again and wait until she feel asleep again. Then id lay her ever so gently in her cot and hope that she didnt feel the difference. Quiet often she did and we would be on the lounge again.

Anyhow, i would have to feed her, take her to bed and tuck her in. All the while telling her it is time for sleeps. This had to be the same every night, the words were all part of the routine. Then id grab a chair and sit beside her bed ( she was 22 months i think at the time) all the while talking softly and reasuring her, yes she would be protesting. Then id place my hand on her so she knew i was there and she had that contact still talking calmly to her ( yes it was hard to stay calm). Then i was told to wait 5 minutes and if she still was upset to get her out of bed and settle her down, then once settled do it again. Do this for 15 minutes then if no luck revert to old way especially if they are really upset at this stage. Eventually she would get the routine and start to settle and sleep. Next you had to break the contact. So you still sit by the bed but you put your back to her, she can still see you but you have no contact, remember you are still soothing her with your voice/song. Then when you get through this stage you try to move away. So you do as above and sit on your chair with your back to her but this time you move it a little bit away. Slowly but surely you eventually move the chair to the end of the bed until finally you can walk away.
I really hope you get something out of what ive written. I was extremely hard and took along time but it did work in the end.
The other thing that is important to do and we do it with all our kids today. Is set the scene for bed. Turn all unecessary lights of, just have dull light, turn the tele down. Then maybe read a book before bed or have cuddles on the lounge without feeding. Just find something quiet to do with her and keep it the same everynight. Kids like reportition so she will get used to it and expect it. Always keep your voice calm and soothing, same goes for DH. Get him involved to to give you a break. Maybe he and DD can sit and he can read her a book. Routine is the key really.

We didnt agree with control crying either and there is no way id stick a bottle of formula in any of my kids mouth. Its not the breast feeding thats the issue so why suggest you change something she is used to and create more drama.

As far as the biting goes, DD is doing the same to me atm and i give her a firm no and slight tap on the cheek. She soon stops and starts crying but is not keen to do it again. You really need to be firm with her regarding biting. Even a sturn voice when she does it and if she still doesnt listen, say no again and take the breast away from her. She will soon learn mum is not joking and you will take away what she loves. Have you tried her on some rusks for her teeth to cut. My DD has 7 already and i gave her chewers that have been in the fridge or rusks. You could always use bonjela if its thats bad. I dont really like that stuff but if you feel her teeth are bugging her that much. Or alternatively you could give her some nuerofen for the pain before she goes to bed, at least she will get 8 hours of pain relief.

The other thing i just thought of is do you think a night light might help. DD#1 never would settle when younger but a night light did the trick.

Good luck with it. Your not alone either, there are lots of first time mums out there that feel the same. It does get better and the subsequent bubs are so much easier. Our last DD is unreal, i just put her to bed and she goes to sleep. Even DS was easy. No going of to sleep on my like my first.
The only way to avoid doing that is to go back to basics, feed them, wind them change them, then put them to bed. That way they are still sleepy but not alseep on you. Even a bath before bed is a winner.

Let me know how you go and if i think of anything else ill let you know. Hang in there. It does get better.