I’ll be in Namche Bazaar for the next two nights.
The trick to acclimate to the altitude is to do it slowly. Yesterday I spoke with a Spanish couple that I had met earlier on near Kinja and were like most trekkers going at a great rate of knots towards Everest. Today they came back down, a wise decision, after suffering from headaches and nausea. They had skipped the well-known rule to stop at Namche for at least two nights before going up no more than 300 meters to the next village. Instead, they had stopped for one night at Namche and walked all the way to Dingboche the next day. No mean feat but it’s likely to kill you as they found out and they had walked through the night to get back down.