I think I have bedbugs?

I've been getting bites around my ankles for a couple of weeks now, but I thought it was just fleas or an errant pain-in-my-ass bug. Today, I woke up with new bites on my torso, and three bites in a row (a tell-tale sign, or so my boyfriend has told me in the past from his personal experience).

I am just barely holding it together at work. I don't know what to do, and I'm panicking at the thought of having to shell out hundreds if not thousands of dollars for extermination.

Are there cheaper/natural ways to take care of this? I'm supposed to go visit a friend and spend the night tonight, too—should I cancel? I don't want to infect his place. I have no idea what to do.

Please please please help!