I feel your pain! My girls also teethed early and bam! that ended the long stretches of sleeping!
Our solution ended up as follows: two mattresses on the ground, one single and one king. The single is up against the wall and the king is up against the single. Guard rails are strategically placed around the mattresses in places where little sleepers are likely to roll (this determined by painful experience
). The order of sleepers goes as follows: wall, dad, Alicia, mom, Annika, guard rail.
I roll back and forth between them all night long. I don't find it helpful to count how often, it just makes me crazy and I can't go back to sleep. One friend with a similar situation with a singleton took the clock out of her room. I haven't had to do that - yet. But rolling back and forth between them I only wake up for short periods.
My girls wake up at 5:30 a.m. so again, I feel your pain. In my case, I rest whenever they nap during the day rather than doing chores. Since you're also dealing with an older one you might consider getting in some afternoon help, for example, so you can rest with the little ones (or older one, whichever) while an energetic person deals with the waker(s). I find that resting when they nap, even if I don't sleep, is the key to getting through the day.
Again, I feel your pain. I had a particularly trying period of getting them to sleep tonight and I'm sitting out here with the baby monitor on in case someone starts yelling but hoping I can relax and keep from poking my eyes out from the frustration - grrrrrr!
You're right on the money instincts-wise about what's causing the waking and what to do about it (DON'T get up! nurse in bed!). So keep at it and use what little brain power you have to help you find a way to get some rest (ha!) during the day if possible.
Good luck and please update on how it's going!