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.