Taking showers was painful for Silvana Heller-Scheunemann, and her clothes brushing against her skin was hardly bearable. “My head felt like a pincushion,” the 50-year-old “long Covid” patient says. Like many people, she’s had to grapple with severe long-term effects of the disease. And a new wave of Covid-19 cases this autumn and winter in the Northern Hemisphere could add to the numbers of so-called “long haulers.” Cognitive impairment is a common long Covid symptom. Heller-Scheunemann, currently receiving treatment at the Seehof Rehab Centre in the German town of Teltow, near Berlin, sudden…