Melanoma concerns

Hello, 

I noticed a new mole on my forearm a couple of years ago I have been kind of keeping an eye on it, I took a photo 12 months ago and then when I looked recently it looked a lot bigger and darker than then.

I saw my gp and then the dermatologist yesterday, he said he didn't like the look of it and can't rule out a melanoma so I will be having it removed within two weeks.

I am so frightened now because I have left it so long I am having shoulder and neck pain which I am now obviously connecting to my mole, I am just terrified that it is a melanoma and also that it has spread because I have left it 2 years I don't know what I'm looking for on here really I just keep googling stuff and it's making me feel worse