I hope this isn't entirely unhelpful, but even if you do go to the psyche ward, and you cooperate with treatment, and talk things through, the chances are it might not be a too horrific experience for you, and they will probably release you pretty soon.
Just a thought for your worst case scenario.
The chances are, unless you're deemed an immediate risk to yourself or others, you probably won't get sectioned. What you tell them is as important as anything else.