My FIL has been diagnosed with stage 4 cancer

My FIL has recently been diagnosed with stage 4 lung cancer and he has only 10 months to live. It has already spread to his liver.. My husband is extremely distressed and I have never seen him so heart broken and cry so much. My FIL is a very good man and his sons respect him a lot. So they're extremely shocked and upset by the tragic news.

I have a mood disorder and I recently had an episode while trying to come off meds and am treading very carefully not to overstress myself while I get back on my treatment. I work full time in a high stress job and while I am very sad that FIL is going to pass away and he will be in a lot of pain, I am worried and scared how things will be like. My husband is trying to stay strong and I am very sad for his loss.. I have been trying to do everything around the house by myself and leave him alone (we used to argue a lot over chores) , then I came down with a flu.

I am scared and anxious how it's going to be like for the next year.. while I am good at handling work and work stress, I am not very good at coping with relationship stress, but if I get sick, obviously I cannot work and that's the last thing I want.. I am trying my best to be supportive to my husband but I am also trying to look after my mental health and it's very challenging.

Please be kind and give me words of encouragement.. if anyone has experienced something similar (cancer in the family or in in laws family) please share..