Unknown Results for Cancer

My name is Maureen Bacon. I'm writing in regards to my husband Glenn. He has had 2 cancers in the past. He had prostate cancer in 2004 and it was stage 4, they did a prostatectomy done. The Veterans hospital in New Hampshire did this.Than did chemo and radiation. Than in 2012 he had stage 4 Breast cancer. The Veterans hospital in New Hampshire sent him to a female breast surgeon and she blew him off. So the story goes, my son lived with us, and he had 2 dogs. They were pitfalls, very friendly. The female had started to follow my husband Glenn around. Where ever he was she sat right next to him. One day he went into the bathroom and when he came out, she jumped up on him and scratched his nipple. Than a couple days later it turned black and inverted, we went to a Dr. and he had Stage 4 Breast Cancer in his left breast. Now we live in Florida and Noone has found anything why he's lost like 40 to 50 pounds. He's had all kinds of different tests. They even took a PMAS scan with no results of cancer in his body. I am very Scared and not sure where to turn or what to do?????? I sit by him and make sure his stomach goes up and down. Some nights I sit here and cry. He was in the Air Force back in the 70's. Please let me know what I need to do to help him??
Thank You,
Maureen Bacon