My thoughts are with you all USP. I know you will be strong for your mom as you have been doing, but dont forget to grieve yourself, it will give you some comfort.
Prayers from our family to yours. As Ranger said take time for yourself to grieve . Holding everyone else up at the expense of yourself seems natural but you will need to be there for them later and that requires taking care of yourself also.
I'm sorry to hear that man, my prayers are with you and your family. Stay strong but don't be afraid to grieve and let the feelings out. Holding it in does more damage than good.