Allen,
I’m very sorry to hear that.
I’m surprised a doctor would tell you that you have colorectal cancer that spread to your lungs and not tell you what stage it is?
I’m not a doctor but have found out a lot of info on CRC in the last 4 yrs.
The only uplifting thing about Cancer is the advancements happening in treatment.
And with AI assistance now, it shouldn’t be too long till they can cure all stages of this accursed disease.
Google, learn current advancements, look for recent breakthroughs. Then all you can do is put yourself in the care of doctors you trust and, get second opinions. Fate already knows the time & place. There is no point in ruining your current life because you are nervous about your unknown future!!!

Good luck Allen and remain positive !!!