They were staring at relegation when Aston Villa thrashed them 4-0 but they have responded with two wins and now a draw at White Hart Lane.
Megson said: "We've just played two cup finals. When we trooped off the pitch at Villa Park we were the lowest we've been for some time.
"It was a really poor performance and result and we had two away games coming up. We managed four points from them and it's a position when the Sunderland game is a cup final.
"We will have 25,000 people there, hopefully helping us get a result we need and then let's see other results. It's so complicated.
"It doesn't matter if Sunderland are safe or not, we have to perform like I know we can."
Megson admits his side were fortunate to get a point at Spurs after struggling to create chances.
They took the lead just after the break when Stelios Giannakopoulos tapped in but Steed Malbranque levelled in the 52nd minute.
Despite Birmingham and Reading drawing, Megson did not view the 1-1 as a missed opportunity.
"We have to view ourselves in isolation, not other people," he said. "We didn't play well and were fortunate to go in at half-time all square, although Tottenham didn't have many chances despite the possession.
"To score the first goal we're pleased with but we didn't hang onto it long enough.
"It was probably not an opportunity lost, given the opposition."