Newly diagnosed with breast cancer and waiting for Scans

I’ve just been diagnosed with stage 2 breast cancer but waiting for scans to check if it has spread elsewhere, I don’t feel well and feel like it has spread and am really worried what the results will be. At the moment it’s a large lump and has spread to the lymph node so starting chemo first, even though I pretty much knew it it’s been a very tough week 

I am positive about the treatment but just terrified this is going to change when they see if it has spread... the waiting is hurrendous... trying to have fun with my kids,work and keep busy but just walking around in a daze and trance...