My husband has cancer and I Am lost

My hero has been diagnosed with myeloma. He is my rock for over 22 years and to think of a life without him is unbearable. I literally am on the verge of crying at any moment and can barely talk to anyone. We have 3 grown up children who all live away and although I have a good friends and family network when it's just me and him I just can't seem to get past the thought of living without him.  Just writing this makes me feel I'm being self indulgent and to pull myself together.  I try and keep hold of the positive stories I've read,  I Just can't keep those thoughts at the front of my mind.