It is good to express your grief. Sometimes it is just hard because the timing may not be the best... However, do not feel as if you should be quiet about it. It may help to let your co-workers know you are going through a period of grief after losing your mother.
I remember reading that it helps to rent sad movies or cry in the shower which may help you to stay sane during your work time... But, I do think that you should contact the hospice counselor to help you through your period of grieving... Heaven knows that they have the knowledge to help you through this.
Do take care Patty. Be gentle with yourself... We are just so glad that you are sharing with us what you are going through - it helps!
Love and Hugs from Glenda