Oh dear! hope things were better last night.......and tonight. Teething *should* only take a few days.
Think Louis is teething too, he's been mega grouchy and had a few bad nights (took him into our bed at 4am as i was SO fed up
)
I give him calpol if in doubt.
As for feeding, if you think she might need a feed in the night i would be tempted to do it as a DF so it doesn't perpetuate the habit of needing milk when she wakes.
Fingers crossed for tonight