I'll try to be brief, but I think there are a few things going on. DD is 4.5 She is bright, has a really incredible imagination, is quick/aware, and sensitive. She has allergies, asthma, and eczema...and I think these play a part in her sleep problems too. We are visiting a naturopath this week

, and may try chiro as well.
Some background:
E has never been a great sleeper-very light, very restless. She slept with us for the first 6 mos, then p/t co slept on and off til she was 3 (for months at a time, she'd STTN; sometimes she'd sleep til 12, sometimes til 3, then be in our bed).
When she turned 3, a lot of changes came: she moved to a big girl room (she'd been in the nursery attached to our room), her baby brother was born, she started a new preschool. During the day she was happy and excited about these changes. No real issues with brother, loves preschool, was excited about her new room. DD started waking 5-10 times a night. We'd get up with her, take her back to bed (not into cosleeping with a newborn and toddler), get her settled, etc. On the nth visit, DH would just fall asleep in her bed for the night (yay, Queen size bed). Eventually he just began sleeping in her room, as we knew she'd be up anyway, and we thought it would be short term. Our motto tends to be "whatever it takes to get the sleep".
THE CURRENT ISSUE:
So...she still wakes several times a night. At times, she comes quietly into our room and one of us takes her back to bed. I can handle these, but she also has very disturbing episodes where she is thrashing around, hitting, very upset, totally incoherent (though speaking clearly, what she says does not make any sense), screaming and crying. It is very distressing for us to see her like this, and only sometimes does she seem tor espond to what we're saying to her. Tonight she has been up twice already with these (and it's only midnight)and it takes 30+ minutes to re-settle her.
So...at what point does she have a "problem"? She is losing a lot of sleep and we are just ragged trying to help her all night. Is there anything that conventional medicine can do? She is crying again, so I have to run, but i will try to post back here later. Thanks for any insight you have!