Hang on to (someone or something) like grim death British verb phrase
To grip, grasp or hold someone or something tightly because you do not want to lose it or fall
As soon as the branch broke off, I hung on to another branch like grim death.
The verb "hang" should be conjugated according to its tense.
Try to avoid to change something because doing something else could make things worse
I could have changed my answer, but I decided to leave well enough alone.