im sorry that you are having such a hard time. is she tongue tied? this can solve a lot of problems if she is tongue tied; they just clip it and all better! remember too, its only 10 days in. normal babies take up to a month to get used to nursing, and so would you! make sure shes getting enough of the nipple in her mouth. this can solve a lot of your pain issues. go to www.llli.org to seek help and diagrams on proper positioning and latching positions. she cant just have the tip of your nipple in her mouth, she has to have a lot of the colored portion in there too. the nipple will be far back on her tongue. if shes tongue tied, shes going ot have a hard time getting her tongue to cooperate.
but i understand if you want to stop. im a strong breastfeeding supporter, but i dont know your situation, so heres the stopping info.
its likely if you stop cold turkey, you will be in a lot of pain from engorgement, and can develop mastitis, and she will likely not take to the bottle right away. drop one feeding and get her used to the bottle. maybe once a week or so drop a feeding at a time? its probably easier if someone else did the bottle when you arent in the same room. she will sense smell and see you and she would prefer to nurse. but its up to you.
just take it one day at a time. if it works for you, you can nurse her once or twice a day and bottle feed her the rest of the time. she will get a GREAT immunity booster (that formula will NOT ever give her) and she will still be able to grow and be healthy and it will give you a break. your body will adjust to whatever amount of time you nurse her.
but anyway, i would stop gradually and let your milk supply naturally diminish in order to prevent the engorgement problem.
but if you are willing and able to deal with it, do whatever feels best for your family, in all things. good luck.