Hi, I'm looking for honest professional opinions on my situation as I didn't ask enough questions during my original breast examination. 

So I went to my doctors on Tuesday, I had found a lump in my breast several years ago that had been examined and ultra sounded at the time and I believe was shown as a fibroadenoma. I don't remember a lot from back then, but what I do remember is it was only about 3cm in size and always felt ridged to the touch. My first breast examination at the GP was unconcerning, my doctor reassured me she wasn't worried but due to family history had to send me to be checked out. 

Fast forward to now, I've been chronically sick for the past two years, diagnosed with Fibromylagia and IBS. A lot has happened in my life, some very traumatic events have occurred, I've been very unwell and hadn't been doing my regular breast examinations. I did one again recently and realized my original lump had grown significantly. 

This breast examination was different from the one before. She was lovely, but once she had examined me she changed. Instead of the usual "don't worry most women who are sent here don't have cancer" and all of that, she told me it didn't feel right. She looked very concerned and said it's not smooth to the touch and has weird sides (sorry can't remember the term as too stressed!) She referred me to the two-week appointment breast clinic thing I'd done before, but even at the end of the appointment she seemed very concerned and asked me to let her know how it goes. 

I have since done a much more thorough examination of myself. I can feel that my armpit is a little swollen or harder on the side with the lump, and I have roughly measured the lumps new size. My breasts are about 11/12 cm wide, and the lump takes up the majority of that. I measured it at around 9-10cm. It seems to be a slight c shape, as if cascading from my nipple. There is actually only a small space in the gap of the c where you can't feel it. It also can move a little bit, but not around my breast. 

The reason I am so concerned is my family history. My grandma on my father's side got breast cancer sometimes in her mid to late 20's (I'm 25) and died in her 50s after a very long and horrible battle. To add to my anxiety, I am the spitting image of my late grandma and have been diagnosed with many of the same conditions as her so far (migraines, psoriasis, same allergies etc). 

What I want to know is how bad is this looking? Is there a type of breast lump that can grow that much and not be cancer? And even if it's not cancer, what is the likely hood I'm heading for surgery to get it removed? I'm currently technically homeless and sofa surfing after my family kicked me out, and my partner and I are finally at a point where we can get a place and start building our lives after working very hard. I just want to have a realistic and honest idea on how this might go on Monday with my breast clinic appointment. It's hard to focus on flat searching and building your future when there is such a big unknown, and the cancer red flags are adding up for me. 

Thank you for any advice you can give.