Freaking out!

Hi, 

I'm kind of freaking out and found this chat after Googling breast cancer symptoms. Im 41 years old and have always had an inverted nipple after breastfeeding my second child. Ive had it for 20 years. The other day I felt a lump behind the nipple and it has been itching for ages. I went straight to my GP and they referred me to a breast clinic. This was last Friday and I have my appointment on Monday. I thought I was coping fine but I can't sleep and end up bursting into tears randomly. I have 4 children at home and am trying to just be my normal self round them. Any advice on how to get through this waiting period?