TTCing while dealing with immense stress... Advice please!

Okay, so we have been ttcing for about 3 months seriously. Last month I found out my mom has stage 4 lung cancer (small cell) with metastasis in the liver. She just started chemo, but the prognosis isn't very promising (max 2 years). I really want my mom, my best friend, by my side through this, I want her here for my first and probably only child. I'm almost 30. Any one have any advice on how to deal with feeling devastated and stressed while trying to figure on her and trying to conceive a baby?