Pretty sure I have breast cancer..

I have been complaining for a month now that my bra was getting to small, even when I wore one that used to be to big, and this week I felt pain in my underarm which was already a bit swollen since before. But that was something I had just brushed aside. Now the swelling had increased and I could feel a lump. cancer goes in my family on both mums side and dads side so just to be on the safe side I told my sister, who called me paranoid and drama, or yelled it. I was still feeling unsure thinking it's always good to check it out. The next morning she somehow had a change of heart and told me I should go to the doc so he could tell me it was fat tissue as she said it was, so after class on wednesday I went to a GP, I had a lot of problems getting an appointment since I don't speak the language here(I study abroad) and in the end they felt sorry for me and with the help of google translate I managed to tell them about the lump, she palpated it and directly sent me to a bigger hospital and told me that a gynecologist needed to have a look. I went there and had the same problem with nobody speaking English. But in the end I was refered to a doctor that spoke English and she toke my family history and palpated, and told me she had to do a ultra sound. She told me not to be worried until we actually found something and that she was looking for a kind of shadow. Well she found something and after that everything kind of went into a blurr. I was crying and really really panicking. I'm 21 years old, live here with my sister that was no support at all, and had the doctor tell me I most likely had breast cancer. I was sent to the oncologist where a second sonogram was made and he detected 2 very swollen lymph nodes. He asked me if I had been sick recently which I hadn't. Not since Christmas. And he looked at my hand and my arm and I could see his expression becoming more and more serious. And he said, you have no fever, you have no wounds on you hand, arm or anywhere else but you do have two very swollen lymph nodes. He checked the breast but couldn't find anything and told me he couldn't do more for me and told me around 3 times that this was not normal and that I needed to get it checked up. After that visit I was so happy thinking I don't have cancer that I didn't really think of all that had happened that day, when I came home I noticed that one breast was a bit bigger then the other one, and my breast have always been proportional. I haven't been able to see a difference between them before. My sister told me that it was all in my head and that I was looking to closely. I thought that maybe she's right so I let it be, the next day the shock really hit me of all that had happened and I spent the entire day crying, my sister called me drama and told me I just wanted a reason to be depressed and that I was emabarrising her when I cried in school in the bathroom. I no longer speak to my sister, but yesterday I looked at my breast again and the swelling had increased, and I thought maybe I am just tired cause it was around midnight when I got home, so I decided to wait until morning. I just checked and you can see a clear difference between my breast, well I can atleast see the difference to how it used to be. And it feels weird, it doesn't hurt anymore but just feels weird, I don't know how to explain it, like it's heavy. My arm feels weird as well. 

Right now I'm at home panicking alone, just waiting for Monday so I can get home and get an appointment with a doctor that speaks the same languege as me. Once home I'll go through all the test to see if this really is breast cancer. I'm literally panicking and am so scared that there is a tumor but that they will miss it cause in my age the breast tissue is dense which makes it harder to detect tumors. I really need to talk to somebody who's been through all of this and just talk. Right now only my brother knows and my sister with whom I'm not speaking to. My parents doesn't know and I'm not sure if I should tell them. I only have my blog to express myself through and I really need a person to talk to or chat with.