Poor you! Did they take biopsies today? Unless they did, I don't think there's anyway they would be able to know 'instantly' whether it is benign or not.
I've had two sorts of lumps and the first one looked like it was malignant according to the specialist who did the scan after the mammogram. It wasn't until the biopsy results came back that they could tell me it was benign, and even then they weren't 100% until they whipped it out. So hang on in there - some of us are just more lumpy than others!
Oh, and I'm sure tomorrow will be a better day. You can't have too many days like today anyhow!!