Hi Can anyone help!

I have a 7 week old who will not go down in her cot.
I have been following the easy routine and baby is doing OK, but will not go down her own cot.She currently sleep's with me in our family bed.
At first she would only sleep on a chest which was my fault. I felt guilty after 27 hours of labour and an emergency c-section. We had so many visitors that held her all the time she became very used to falling asleep on other peoples chest's.
I then decided to follow the Jeana Ford routine. She managed to fall into the feeding pattern of every 3 hours but wouldn't follow the sleep routine, so i decided to abandon this.
Lot's of people advised me to let her cry it out. I sort of did this but kept going into her as i felt so guilty.
I have tried the patting and sh sh but she gets into such a state that i have to rock her or offer her my breast to settle her again.
It's as if i am punshing her if i put her in her own cot. Everyday i try again but result to given in as i feel that some sleep is better than no sleep at all.
I currently express my milk and do half formula, which is lactose free as she has an allergy to cow's milk.
The breast just seem to be for comfort for her.
I really do not know what to do please can some on offer me some advise or help aids. I know that she is still young and it should be easy to train her but she is very advanced for her age and seems to know what I'm trying to do.
Madeline Owen- desperate Mother