my heart is heavy reading about how much pain you are in. I have read others responding to your post suggesting going to the ER. I totally agree with them.
Pain is a medical emergency and is treated as such in emergency rooms all over the world. I have worked in the field of emergency medicine for almost 20 years. Patients who have cancer are treated very well. Healthcare workers know we are already going through a lot. As a result, they will get you in fast as well as break out the box of stellar pain medications like hydromorphone aka Dilaudid.
In your case, I would imagine the first priority would be to get your pain under control. Next, you would have some blood tests and at least a chest xray. Depending on 1) how you feel after treatment, 2) what the blood tests point to, and 3) what the xray suggests, you may have further tests +/- a hospital stay to get your pain under control.
I hope this reply lays out the route when stepping into an ER.
Mary, you have to go to the ER dear. You owe it to yourself. Severe pain is a sign that something is not right. You should get it checked out.
Please keep us posted on how you make out.
Sending you love and healing thoughts, Carolyn R.