Hi S.-
I also exclusively breastfeed, and the birth was traumatic for both my son and me.
Never let any baby or child cry until they vomit, ever. They cry because something is wrong, not to manipulate you. They don't learn to do that until at least 1 year old, and at that point, you can tell if it is a true cry for a need or a whine cry for what they want. And even still, crying should be addressed, and not ignored.
Having been in your shoes, I know this can be tough. Remember that you are not spoiling your baby, and even though she is very demanding now, things will change.
Before I had my son I was working as a server (waitress) 60-70 hours a week. I am used to running nonstop and being in a high demand/stress environment. 1 year later, I can tell you that going back to working part time is all I would be capable of with my son at this point, unless I had the money for a nanny, which I don't. So I stay home, and as much as I miss my job ( coworkers, regulars, & actually feeling like I accomplished something) I am better off. But I digress...
I exclusively breastfed my son until he started on solids, at about 6 1/2 months. When he was 6 days old, we had to bring him back into the hospital because he was jaundice, and he was in an incubator under a bili-light for 16 hours. I could only give him a pumped bottle because I couldn't take him out. He refused bottles ever since. Before this happened, I was also able to put him down as he was falling asleep or right after he fell asleep, but the whole being in the incubator for 16 straight hours and not being held messed that up too.Up until he was about 4 months old I was holding him while he slept and he would wake up and cry as soon as I tried to put him down. He refused bottles and would cry and gag until he got me.
I was losing my sanity, trying all sorts of things; putting him down drowsy, putting him down asleep, putting him down with a toy, putting him in a bassinet, crib, and our bed, nothing worked. My pediatrician recommended nursing him down in a side lying position, so the baby is on the bed, not in your arms, and get up but leave the baby there after he fell asleep. That is the only thing that worked for me. Just make sure you wait until you can pick up a limb and let it go and it falls like a rag doll's would, otherwise the baby is not in a deep enough sleep and will wake up.
My son is now 1 year old and will fall asleep in my or my husbands arms and then we put him in his crib. He is still waking up in the middle of the night to nurse (just once) and as soon as he falls back asleep I move him back to his crib, if I'm still awake :) He also will only stay with my husband, I can not leave him with anyone else for more than an hour, otherwise he goes into hysterics because I am not there and cries until I return. This is why I would only be able to go back part time to work. I have found that other mothers that exclusively breastfed without bottles have similar experiences and extremely strongly attached babies.
If you really want/need to return to work, your best bet is to pump and give bottles for day feedings and only breastfeed for night feedings. I could never get my son to take a bottle, I tried this myself when my son was 3 months old. My husband tried to feed him at least once a day up until that point, which never really worked after his hospital visit. Then when we switched to trying it at every daytime feeding he started screaming until he was red in the face as soon as the bottle went in his mouth. That's when I completely gave up on pumping, bottles, & returning to work any time soon. It has worked for other people, just not me. For the people that do get this to work, most of them say the baby nurses more at night, probably to make up for missing you during the day.
I have also had other mothers that had a baby refuse a bottle of breastmilk be quite content with a bottle of formula. One of my coworkers would give her son formula during the day and breastfeed him at night, and it was the only way she could get him to take a bottle & return to work.
Being a Mom is not an easy undertaking when you are used to running your own life the way you want. I know how hard it is to give that control up, I've done it. The best thing I have done is to find a balance that works for me. Instead of going back to work, I started doing direct sales and I babysit a 9 year old girl until she gets on the schoolbus in the morning, and brought the work to me. I can do it around my home schedule. It definitely is not the same as going back, but it works for me in the meantime. Find your balance. Maybe that is finding a nanny that will bring your daughter to you during lunch so you can breastfeed her, or maybe that is working from home some days if you can. If you need help figuring that out, feel free to email me.