Don't kick yourself for spending when you did, because as I'm sure you're aware, it's just as likely that you could be now saying "Thank goodness I used those Bitcoins when they still worth something".
I bought a bunch at ~$1, then they jumped to $10 and it started to be fun, because I had a bunch more value to play with, then they jumped to $100, I thought screw this. This is not why I bought them and if they keep up this volatility, then they're not going to be useful for what I want to use them for (ie. buying/selling online).
I don't regret selling them when I did, and I don't think you should either.