Long term or sudden, severe "stress" can cause me to be hypomanic quickly.... An event in which you described could do it for me, not always, but under the right conditions.

For example, about 6 months ago my mortgage company was claiming they had not received 3 months of payments and were going to start the foreclosure process. I was shocked and amazed, they cashed all my checks every month...However they had no record of it AND my account was put into the foreclosure dept. at Citi mortgage. Well, I got a lawyer, but he was useless and not up to my speed. I sent email after email to the president of Citi Mort. finally I threatened to go to the media. THEN, their lawyer said "Oops, your funds were applied to another lenders account with the same name, sorry. We've fixed the error and you don't owe anything at this time". Yeah, this sent me massively into hypomania with all the stress, worry, emails and calls!