@mwds,
Okay, positive, honest advice.
You
should talk to your therapist. But not as a substitute for your husband caring about how you are feeling. In tandem with it.
As for what to talk to your therapist about, I cannot tell you what to do, but I would suggest asking about chemical therapy because you may need it. At least ask, find out your options. I am sorry that this is happening but you are well aware that you are getting zero support at home, so you need to do things for yourself. I know that it is hard. I do get that.
But the more that you do for yourself in this area, the more you'll be able to do -- you will empower yourself a bit.
You can get through this. It is an illness and, like cancer or a cold, you need to treat yourself gently, take meds if you need them, and rely on your doctor to help you.
You can do this.