Hello. I hope that you are finding some sunshine in your day.
While I have not had cancer, I have fibro since 1998. Over the years, and after trying many medications, I have gone with behavior modification. The medications seemed to make things worse for me, and one doctor told me that because of my fibro, my body does not process medications (especially those that affect your serotonin) the way it should. My daily pain level has remained at about a 5/6, and I've just become so used to it now. On days when I am very tired or just don't feel "good," I rest. I only do what is absolutely necessary, and sometimes it's just sitting and reading or watching TV, knitting, and very rarely napping. For the first 10 years, I did take different supplements, so check with your doctor to see if you might benefit from certain vitamins, minerals, or herbs. One thing I was told to stay away from was phosphates. So I don't drink Pepsi anymore, or any dark soda, and I rarely treat myself to a Sprite or Ginger Ale anymore. Try increasing your water intake to 64 ounces or more. I can usually tell when I haven't had enough water as I begin to not feel so good.
Your body and mind have had quite the trauma; perhaps some meditation, yoga, or even gentle exercise may help you to feel better.
I have only had my colostomy for 8 weeks now, and that was quite a mental blow for me, but I just try to do better than the day before, and when I'm having a bad day, well... I'm having a bad day, but I try not to let it last the whole day.
I am sure there are others here that will be of help. This is a wonderful group.