Matt Jarvis was disappointed to see a lead go to waste in Tuesday night's 3-1 defeat at Arsenal.
The winger nodded West Ham in front as Sam Allardyce's men gained their reward for a positive opening 40 minutes to the game, which rattled their Champions League-chasing hosts.
The most frustrating aspect of the evening for Jarvis and his teammates was that they were only able to hold the advantage for four minutes before the first of Lukas Podolski's double set Arsenal on their way to overturning the deficit.
"It was frustrating," the No7 admitted. "We put a lot of effort into the first half - we closed them down well and we managed to get the ball and create a lot of opportunities too.
"We got ourselves in front, so we were bitterly disappointed that we conceded just before half time as it could have been a completely different game.
"The timing of the goals was disappointing - just before half time and then just after the second half had started.
"Conceding again then puts us on the back foot when we needed to try and get the momentum going like we did in the first half, get on the ball and start creating chances again, but unfortunately we conceded a third."
Allardyce felt Jarvis could even have won a penalty before his opener when he appeared to be clipped inside the box but honestly stayed on his feet.
He explained: "We had quite a few chances even before we scored. The manager was disappointed as I could have had a penalty too.
"I don't know if it was a foul. I don't know if I had gone down whether it would have been a penalty or if I had whether I'd have been booked.
"Maybe I should learn from that and be a bit more clever."
As for the goal itself - a rare header - Jarvis was happy to play his part after being out of the starting line-up for the past five matches.
He added: "I was delighted to get on the end of it and score a headed goal, which is always nice. To score at the Emirates and put us 1-0 up and get in a great position after a positive first half was good.
"Possibly there was a bit of anxiety from Arsenal at the start, but I did think we played really well in the first half and got in their faces and made them make the mistakes.
"When they scored the two goals to get in front, it gave them more confidence and they could start passing the ball around as they normally do."