S.K.
hello there..
i have the same problem with my 1 and a half year old. she has found herself at the point where she never gets a full night's sleep, because she also wakes up all night long as well. i was told by my mentor, I'm a midwife's apprentice, to try bach's night remedy, which i bought at aqua vita. i am going to try it for the first time tonight. i'll let you know how it goes... crossed fingers.. also, i became a single mother to my now 5 and a half year old daughter when she was 2 and a half years old. she also had this screaming before sleep issue, which i handled very similar to you, and it did get better faster than i thought. i bought her a sleepy cd, and played it while i lay beside her bed, until she fell asleep. at first i held her hand while she cried, then the crying stopped, and soon i didn't need to be in her room at all while she fell asleep. it took about 3 weeks of crying. i know how these life changes can be for you and your daughter. i'm free to read or respond any time i can.
good luck,
S.