I am deeply sorry for this loss of your Mom, having lost my father years ago I know the void it creates in your life and grief that some days seems unbearable. Grieving is a journey that you must travel to heal the wounds of your broken heart. God is right beside you, though you may not feel his presence all the time he is with you. I joined a bereavement group in my Church, which provided me with the a faith centered approach to healing. I am not sure if that is available in your Church or perhaps your priest can recommend a good book. I always take comfort in Psalm 23, if you reflect on each line it is extremely moving and powerful.
Come to me, all you who are weary and burdened, and I will give you rest. Take my yoke upon you and learn from me, for I am gentle and humble in heart, and you will find rest for your souls. For my yoke is easy and my burden is light.
With prayer, and proper grieving, you will be able to move ahead and allow all the warm memories of your Mom to heal your broken heart. I equate it to a light going out in my life, but was so blessed to ever have had that light. I wish you peace and comfort in your journey and God’s love to surround you. Your Mom is no longer in pain and is now enjoying the promised Kingdom.
p.s. I noticed you are in Pakistan, I have friends in Rawalpindi!