My tummy hurts.

I just ordered a thousand full-color glossy two-sided business cards and also a thousand glossy two-sided hangtags (which are actually 500 business cards that I will cut in half). The best part is, I got all of them for less than $50, including shipping, from www.gotprint.com.

So why am I feeling nauseated at the thought of spending the money? I'm excited to get them and I know I can't do business without them (in addition to the fact that they will save me buckets of expensive printer ink), but I have such a hard time spending money! I think it's a combination of not being used to having $50 to spend, and also the uncertainty of when or if I'm going to make more money. Business is going okay and ought to pick up even more in coming weeks and months, but every sale is still a surprise to me. I wonder how many other Etsy sellers feel like this, getting cold sweats at even the minor expenses?