Personally, I would stop doing laptime for now. He's stressed and uncomfortable. I always recommend going at the guinea pig's pace and using positive reinforcement techniques to reward the good, brave choices that he made
on his own terms. My girls follow me around the house during floortime, hop in my lap, and give kisses. Remember that laptime is very much for the human, so it really pays to take that extra time to make it all about your guinea pig to teach him to love it, too. I also recommend teaching guinea pigs how to load themselves up into a carrier (or upside down hidey) to allow them to exercise more choice. Low stress methods allow the guinea pigs to feel more control in their lives, which improves confidence and trust in their people.
https://youtu.be/1jE8-BGSG5g
Here is Toora-Loora being reinforced for hopping into my lap. She is still very new to laptime in this video. But look at how comfortable and happy she is.
https://youtu.be/AezSPor0I48
This shows a process (for Fiona), from the first day we brought Fi home to the day she first offered to allow Joshy to pick her up and hold her in his hands.