The 31-year-old, who had a brief fling with a former glamour model following the split from his wife Shelley, ruptured his right testicle when he was kneed in the groin during October's Super League Grand Final.
"People see this giant man-mountain and think he is indestructible after what happened," Wood told The Sun. "But that couldn't be further from the truth.
"Some mornings I couldn't get out of bed and just pulled the duvet over me sobbing like a baby. I've been swamped with suicidal thoughts. As much as I played along with the jokes about being 'One ball Paul', privately I was in pieces."
Wood has two children with his estranged wife.