Enlarged Node in groin and normal CBC

I have had an enlarged node in my inginual region that is now about the size of an egg.  They have done CBC and it is normal but they are still are sending me to see a surgeon Monday for a possible needle biopsy.  My question is should I just let them do the needle biopsy or demand a complete biopsy to rule out cancer?

I need to mention that I have lost 40 lbs since March, have gotten to were I have headaches all the time, more tired than normal, sweat alot easier than a person should, and even though i excerise regularly it has been easy to get winded. Just had a chest xray for an upper gi and it was normal though.  Oh and lets not forget that about the time i noticed the node I started having severe heartburn and that is something that i NEVER have.  I also noticed a petechiae rash on my chest today.  

Any ideas?