Hi Rajin!I'm very sorry for your loss.
I've lost my father to cancer as well, in December 2012. There are no shortcuts to grief, and only time can lessen it somehow, although I'm sure it'll never disappear completely.
One thing that help me was changing my perspective on how I remembered him. Instead of thinking about myself, how pitiful I felt, how he'll never see ME get married, he'll never see ME graduate, etc. When it stopped being about how I felt, and how I honored his memory, the tears slowly began to be replaced with a smile. Not a happy smile, but still, a smile. Now I smile everytime I see a DVD sale and think how he'd love all this stuff, jumping across the racks, picking up his favourites and come over to spoil the story before I've even watched the movie. I smile when I smell someone using the same perfume he used to. Little, simple things.
I don't know how my transits were like at the time he died, but I think it was not half bad actually!
In December 2013, almost exactly 1 year later to his death, my mom was diagnosed with breast cancer. It's been a battle of endless exams, specialist appointments, and exhausting treatments. It's now October and she just got the news: everything is fine and she's gonna make it
I had saturn squaring my sun, venus, mars and mercury... only aspect I can remember. I'm not good with charts and transits, but I read what you wrote and found it so similar to my past experience I thought you could use some encouragement.
Sending good vibes to your mother, and be strong! She'll need it too.
We may feel bad because of so many bad things are happening to us, sometimes we forget it's them who have the disease and are having the hardest time.
Lots of love.
Hugs <3