Hi L.,
It can be difficult when our children start behaving in a totally different way. Take heart, this soon shall pass.
My first thought was acid reflux, which is extremely painful for anyone, especially when they lay down. However, you didn't mention that she has almost projectile vomitting after eating, and you said she naps just fine still. How long has she been refusing to lay down to sleep? Does she really sound like she's in pain when you lay her down at night? Or is it a more of a "I really don't want to be without you mommy!" cry? Seeking your Doc's opinion is a good idea. He/she can rule out anything medical. If it's not a medical problem, what are your thoughts on co-sleeping for a while? At this age, remember, they really are starting to get that they are a seperate human being and not being around their main caregiver -you:) isn't their idea of a good time. Also, sleep patterns change, maybe she needs an earlier or even slightly later bedtime. What is her bedtime ritual like? I know it's difficult with an older child around, (I have 4), and sometimes being consistent is challenging. My suggestion is to breathe in, then breathe out, read a book, take her for a walk, slow dance with her, breathe in, breathe out, take her for a drive, turn down all the lights, lay down with her, breathe in, breathe out:)
Go within and listen to your belly - it will lead you to your answers. In the meantime, take some time to nurture yourself so you will feel more grounded when dealing with baby challenges. Best of luck.
A.