After a very bad cold which started 1/18/18 and lasted about 4-5 weeks, I started shedding hair like crazy, I also had brown marks at the base of my fingernails, at the end of the cold, which I assumed were from malnutrition ....I lost quite a bit of weight. I m 5 1 and weighed around 148 & got down to 137 after cold. I m now back to @ 144lbs. My question: could this hair loss be due to malnutrition, and will it grow back?