SM, my most heartfelt condolences on the passing of your mother. Your entire family shall remain in my prayers during this difficult time.
As men of faith we know and believe in the resurrection of the body and of everlasting life. Your mother raised you to be the good person you are - she instilled in you the morals and principles you have as adult; for that her reward will be great in Heaven.
Each person in my life that has passed away, only has made me realize how precious Life is, and to waste it in negativity is a waste indeed: it has spurred me onto reconnecting with old friendships long broken, and firming up my own family relationships. i just reconnected with my oldest childhood friend last night after some 15 years(!) apart for various reasons -- we played tennis like we did back in High School for a couple hours, then talked for awhile it was great.
Truly as you say, we dont want any regrets when the time comes, for others or ourselves: and the best way to do that is via Love shown in our lives to those around us. Stay Strong my friend!