Are you only on Celexa? Upping my Celexa is why they figured out I'm bipolar- it sent me into a manic episode.
Either way, if you are bipolar and think you need to be seriously seen at the psych. ER, they must see you, as far as I know. You went to the regular ER? Were they busy that night? Did you go to the psych ER? The psych. ER really is for people who are talking about killing themselves, basically. Either that or someone else. There may be other reasons to go, but that's what they always ask when you call. I've called when I've been in a mixed or manic episode and was afraid of doing somethig really weird or when I kept wanting to drive my car with kids into oncoming traffic. Will your regular pdoc not see you?
As for what you can do now, you can go to a DIFFERENT ER, talk to your regular pdoc about your meds (why only celexa if bipolar for one), and eat on a regular basis. That alone would give me headaches- not eating often enough. Also can make you more moody- that and lack of sleep.
Come back and let us know how you're doing.