Feeling Nervous!

4 weeks and 1 day ago i found a lump in my armpit, went to my Dr and she reffered me to the breast clinic. I went yesterday. I wasnt keep on the consultant, he just seemed so uninterested. He sent me to the radiolagist who found a abnormality in my left breast (same side as armpit lump) via ultrasound. She went and got another dr who looked at the abnormality and they sent me for a mamogram, went back to the raiologist who said my breast tissue is really dense so they struggled to see, she gave me another ulrasound and took a fna x2from my armpit lump and a core biopsy x3 from my breast. 

Went back to the consulant who just said someone will call me in a week, hes sure it is nothing to worry about and walked off - didnt even tell me the way out! 

I am 29 - monther had 2x pre cancerous lumps in her 20's and a full hystorecotmy at 28 for uterine cancer. Grandmother on fathers side died of breast cancer at 54. 

Should i be worried? Has anyone else had the same thing and what was the outcome? 

I just keep thinking, im sure they tell everyone they are sure its nothing to worry about. Also the lympthnodes are also up in my breast and im thinking well there has to be a reason. 

Im sooo nervous!