20 month old dd - previously brilliant sleeper - suddenly terrified of cot

[cupcakes]

I don't know quite what has happened - up to 2 days ago she was a perfect sleeper. You put her down for a nap or at bedtime and she went to sleep. She had a bad dream the other night and now she's too scared to go into cot.
Had an hour of crying this afternoon before she had her nap and now she is upstairs crying her eyes out.
To make things worse this pm she pulled a heavy lamp onto her head. She cut her scalp and there was a lot of blood. Consequently she could be a bit unsettled by this (although it wouldn't explain her earlier nap and last night) so I do not want to leave her alone crying for too long.
I have given her calpol in case she has a headache but it doesn't seem to be making her drowsy.
We weren't ready to put her into a bed yet (we need to get a plumber in to move a radiator in her room before we can fit a bed in!) and other than that I can't think what to do.
She came into bed with us in the end last night and I really don't want to go down that path again.
Any ideas??

just thought i would post on this subject, my dd who is 20 months has started doing this, she has had a few episodes since turning 18 months, largely waking at night. More recently she has returned to being a perfect sleeper and then on sat she would not go down to sleep, she stands in her cot calling our names. I know she has not had a bad dream or anything. The first night we took her to our bed, sun, mon and today we have been doing a relaxed version of cc, today she only cried for half an hour! Luckily she does not wake in the night. Have no idea why this is happening? Any ideas? I guess this little toddler of mine will always keep us on our toes!