Lina is 14 months old today (

) and I think we are starting to see some of this so-called separation anxiety stuff. She has been with the same sitter for a year, but she is starting to have a few more sad moments when we drop her off, etc. Also, we have been having some major night-time issues with going to sleep and staying asleep.
Lina has pretty much always slept in her own room in her crib because co-sleeping never made anyone happy. She is a very warm, very active sleeper who is really restless if she lays in bed with us. Plus, I really need my own space, too. We have almost always rocked her before bed - maybe not all the way until she is passed out, but enough to relax and get her to that sleepy stage. No milk, water, or other drinks - just pacifier. Usually I could go in there and rock her for about 5-10 minutes, lay her down and everything was fine. She wouldn't usually wake up in the night and would get up around 7:00 - 7:30am.
Lately, she has been fighting sleep like crazy. I rock her for 20+ minutes, and when I lay her down (no matter if she is 100% awake or asleep) she immediately wakes up, stands up and cries. It is now usually taking 2 (or more) of these cycles to get her to go down for the night. If I try to take her my bed, she freaks out and cries a ton. I am not one for letting her cry - and even if I am frustrated and just need to take a breath for a minute, she screams and really gets super angry. Plus, she has been waking up in the night - either needing to be rocked for 30+ minutes, or not going back down at all. Saturday she woke up at 4:00am and didn't fall asleep again until 7:30am.
Please tell me this is a stage that will pass - I've heard that night-time issues can come with the separation anxiety stage. Also - tell me that it's ok that I am spending so long rocking/holding her. My mom says I just need to let her calm herself - that she's old enough that she knows what she's doing and that I am teaching her to depend on me to go to sleep. I was able to be stronger in my stance about not "spoiling" her as a tiny baby - but this girl is smart and she's definitely grasping the concept of "cause and effect" in other areas of her life. Plus, we have tried a time or two to see if she will really get all that upset without being able to get past it herself - and it does NOT stop. Crying, yelling, throwing things out of her crib - and if we go in just to comfort her, she tries to hit us and is upset until we pick her up.
I want to say that it will pass - but then again, I don't really want to HAVE to lay down with her every night until she is 6 like my mom SWEARS she had to do with me.