My grandfather went to heaven, it made me so sad  

I am sorry to hear that, baichenxia.
It happened to me when my grandma left us and I couldn't really got out of it. even now, I get the feel that she is with me. Dear, it will take TIME to overcome and nothing can comfort us of this irreversible losses. I try to live with the good memories that we have shared.

smiles...

Hi, baichenxia. I'm sorry to hear that. I hope you will get through this. It's unevitably to get rid of sadness. I felt sad and cried alot hen my grandfather passed away. But we still have to continue our lives. We can only do our best and achieve our dreams, i think this is what our grandparents want to see from us. Even my grandfather passed away, but he never leaves me, he is still in my heart. My memory about him will never fade away. It's normal to be sad, but you won't be sad all the time, time will take away your sadness. All the best for you!

What you are going through is natural. Take time to grieve and time will help you feel better. Remembering him now will make you sad but will give you warm feeling when you get over the grief you have now. I am sorry to hear about your grandfather.