3 week wait for blood test

Hiya,

I hope I'm just being paranoid but I have a lot of symptoms the last month and a bit that Dr Google relates to cancer.

-High temperatures

- itchy skin

- bone pain

- tiredness 

- loss of appetite 

My GP thinks this is viral but wants me to have a blood test just in case but I can only get a test for 3 weeks time. Since going to the drs I'm feeling worse and can barely pick up my 1 year old with the pain in my arms and hands.

Is it possible to go for a blood test somewhere else? If so where can I go? I don't know of its appropriate to go to A and E?

Thank you for any advice