Do You Think I Have Leukemia?

[Darshanie]

At the beginning of the year I had gotten a Swollen Lymph Node in my left underarm that lasted about three (3) months which was painless, I thought nothing of it. I started to loose a lot of weight; about 20 pounds. I was really tired all the time and sleeping wasn't helping me, and I would bruise easily. I told my parents but they also thought nothing of it.

Around the Month of May, everything stopped. I've gained some of my weight back because I was eating a lot. I was still really tired all the time and the swollen lymph node was gone.
On the 12th of August 2016 I discovered two swollen lymph nodes in my groin area.
One hurts really bad and the other doesn't, only when I apply pressure. Since that day I've been having headaches and occasional diarrhoea.
I also encountered a slight rash on my calves a few days after.
I've started to lose weight again and I can't walk too long distances or go up the stairs without being winded.
On Monday, I saw there was a swollen lymph node on my left underarm and it was very tiny and it didn't hurt at all.
But now, it's getting bigger and its very painful when I raise my arm and even when my arm is down.
Also the lymph nodes in my groin are still there but they went down a little.

I have a doctor's appointment in the morning and I'm really nervous.
Please tell me your opinions.