A persistent foot injury plagued Wood last season and the Northampton Saints ace admits he feared he might never reach his peak again.
However, he has played every minute of every game for his club so far this season and he hopes to force his way into the England set-up for the Autumn Internationals.
"There were a few times I lost it, blew up with frustration," Wood told the Telegraph.
"You know, the worst thing was that, at certain times, I was almost fit. I wanted to get out there, do the right thing, front up and help the boys, but I wasn't allowed.
"I felt like sneaking off somewhere and having a few crafty random mauls round the back of the bike-sheds like a smoker. In the end, it got to me, you did wonder where it would all end, wonder if your career was over?
"Now my form is OK. Well, actually, I'm not overly happy but it's acceptable from where I've been. But I expect a lot more of myself, a lot more."