I renounced my U.S. citizenship in 2011. After I did it, I was so emotional that I threw up outside the embassy.

During my renunciation, I broke down. It was like getting a divorce. America gave me my education, a good career path, and I came from a beautiful part of the country. This was very hard.

Before I took the last oath, I asked if I could change my mind. The embassy worker said maybe, with official permission. But I still went through with it.

My decision to renounce was triggered when my bank threatened to close my account because I was American. What would I do without a bank? Americans in Switzerland were having trouble with their investments, getting credit cards, and some weren't even getting loans.

I've been in Switzerland since 1990, and became a citizen in 2005, because I wanted the right to vote where I was living. The Swiss can tell I have an American accent, and I'm often explaining that I grew up in the U.S. and have a daughter who still lives in the Boston area.

Related: Share your expat tax story

Filing taxes from abroad had always been a real pain. I was double taxed on my full pension, but it didn't bother me so much to pay taxes -- it was the annoying paperwork. I used to do my own taxes, but I started going to a professional when I learned about the new disclosure laws. I'm glad I did, because there were a lot of forms. Tax prep costs me about 1,000 Swiss francs ($1,123) a year.