"Now I just try to hold it seam up and whang it - it seems to be working."
Meanwhile key batsman Kevin Pietersen is also struggling with an Achilles injury, but Strauss said he was optimistic of having both him and Flintoff available for selection at Edgbaston.
"We'll see how they react over the next three days but we're hopeful we'll have a fit team for the next Test," he said.
But England coach Andy Flower revealed that he was not convinced that both would be fit for the third Test, which gets under way on 30 July.
"Fred's performance was sensational," said Flower.
"He's a brave guy and he's played through pain before. He's also the sort of guy to give the team confidence. But if he's not fully fit and doesn't think he can get through the game he won't play.
"At the moment we don't know - we'll make that decision when we get closer to Edgbaston.
"Pietersen's been playing with an Achilles problem for a number of months and it's been difficult to diagnose.
"It does affect your batting. It makes it very uncomfortable. He's good enough and man enough to deal with it but it is an uncomfortable situation.
"It's fortunate we have a break before the next Test."
England had narrowly avoided defeat in the first Test at Cardiff before bouncing back strongly at Lord's, and Flower was keen to stress that there is a lot more work to do if his team are to reclaim the Ashes.
"I am very happy and very proud," added Flower. "I was a relieved man after the Cardiff escape but take a lot of pride in how we played and handled pressure in this Test.
"Now we want to build on it but there's no room for complacency.
"They are the world's number one team and they will go away and regroup and we have to do the same.
"We've won one match and we want to win the series. There is a lot of work still to be done by all of us."
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