I have had blood tests done and they could not find anything but I have been having a foul smelling odor and milkish like discharge what can it be?

Wet prep. A pelvic exam and wet prep sent to the lab will likely answer your question.
Vaginal cultures. Along with the pap smear and wet prep , you can send cultures to check for certain bacteria that cause vaginal discharge and odor which may not be picked up by the other methods.