Dear scared,
I have had very similar experiences. I have many moles all over my body, mostly on my trunk. The first time I went to do a mole check a few year ago, the doc said that I have "lots of irregular-looking moles." He biopsied 3 of them. I was terrified and in the same state as you describe, thinking this is it (I am a catastrophizer by nature :).
What I learned since then, as I have been getting annual mole checks and have had additional biopsies over the years, is that many derm docs tend to biopsy anything that looks even slightly irregular, just in case. Many people can have lots of irregular looking moles, and most of them are normal. But they don't know for sure unless they biopsy it, so better safe than sorry, even if it's just a 1% chance.
A dermatology resident also told me that of all of the skin biopsies that are performed, 99% turn out normal. This put things in perspective for me and helped to calm me down until the results came back. Also, even though they say that the results take 2 weeks, usually they have results much sooner. Try calling to find out, it may cut down that waiting/not knowing time.
Good luck! Chances are very good that you are just fine :)