Jenas has not played since his summer loan move from Spurs to Villa Park after being sidelined with thigh and Achilles problems.
But the 28-year-old midfielder could make his debut against Norwich on Saturday after finally recovering from the injuries that have wrecked his season so far.
Jenas said: "My start here has been very frustrating. When I first arrived, I was flying in training. I was getting my head down and doing well.
"I was so excited about the prospect of starting at a new club and then I felt a little twinge in my quad on the Thursday before the Everton match.
"It was very, very frustrating. Then I had the Achilles injury too. I came back, fought back in the gym, worked hard and all of a sudden my Achilles was really, really sore. I just thought 'what more?'
"It was heartbreaking. It's been a real, real test of mental strength."