Symptoms of Leukaemia and very worried

Hi, sorry if this seems dramatic or anything like that, I'm just really having a bit of a worry and don't want to talk to anyone about it because i do probably seem quite dramatic. 

I've been having some really bad pains in my legs recently, so bad that i can't walk when it comes on and sometimes it wakes me in the middle of the night and i am not able to move at all. I've also been so so so exhausted like i go to bed and I'll still wake up extremely exhausted. I get fatigued doing simple things that never used to be a problem for me as i was previously fit (plus, I'm only 18 so i generally have a fair amount of energy usually) but for weeks I've been pretty much confined to my bed without even enough energy to go up and down the stairs. Despite this lack of moving, my legs still get covered in bruises, some of which look like little pinhead bruises in clusters around my knees which is very strange as I've never had this before. 

I would usually have just ignored things like this as i hate to bother doctors, however i also discovered a large lymph node in my neck with no sore throat or ears or anything like that and my mum had said my skin was a really weird kind of pale. I'm anaemic, so everybody knows I'm always pale, but everybody i meet keeps telling me my skin looks a very strange colour. I also suspect that my mild nosebleeds and the bleeding gums are from my anaemia, but now I'm just paranoid. 

Due to this, i did go to the doctors and she confirmed it was a swollen lymph node and suspects i have some kind of viral illness but decided to order some blood tests which i am going for tomorrow. I'm really really scared  because I've researched my symptoms a lot and it does point a lot to leukaemia. I was too scared to tell the doctor about all my symptoms, so just said i was tired and had the lump. 

Sorry for the big long post, but I'm just really scared i suppose and kind of had to get it all off my chest. 

update; had the blood test and got a call back from gp receptionist to say the doctor wants me to go in and get a repeat blood test next week but didn't tell me why. i don't know if I should phone the doctor and ask or if I should just wait and see what happens after that next blood test, feel like I'm probably just reading too much into everything and panicking a bit much when its probably nothing