ID this old zombie movie for me, please?

Hi all!

So I was hoping you could help me with the name of this old zombie movie.
It’s been a while since I saw it, so I’m not sure on all the details, but I think it was about a group of teenagers during a zombie outbreak. One girl/woman gets infected, but her boyfriend refuses to let her go, and she uses pain (piercing herself with needles mainly, I think) to battle the zombie “insanity”.
I believe I saw it about ten years ago, but it was probably kind of old at that point already.

Return of the Living Dead III

Wow, that was quick!
Thanks a bunch! :D:D