breast cancer that has spread

I was diagnosed on the16th August and told I had lung cancer which had spread to my adrenal gland and brain I was also told I had a nodule in my breast. After having biopsies in my lung and breast I was told it wasn't in my lung but it was a rare form of breast cancer which has caused a large tumour in my chest. I have an appt with the oncologist on Friday and start chemo on the 22nd. What is worrying me the most is that for about a week I've been having abdominal pain and some back pain. Paracetomol worked at first but now it's not doing anything. I started on steroids this morning which the oncologist sent me. I'm in a lot of pain and can't sleep but I live alone and don't know who to contact about it.