(AP) – The virus that has sickened over 4 million people around the world and killed more than 250,000 others is so new that patients face considerable uncertainty about what they can expect in recovery and beyond. In support groups created on social media sites, survivors post head-to-toe complaints that read like a medical encyclopedia: anxiety, heart palpitations, muscle aches, bluish toes. It’s hard to know which ones are clearly related to the virus, but the accounts help fuel doctors’ increasing belief that COVID-19 is not just a respiratory disease. As one infectious disease specialist says: “The short answer is that we’re still learning.”