My 88 year old father had both of his Moderna vaccine. First shot, he only was really tired for about three days. Second shot... oh boy! I feel so bad for him. Five days after he was just tired. I expected that. Day six... he paged me in around 4am because he was throwing up (which was only a one time incident). His nose is so drippy, and coughing a lot. Nine days later, he is still so weak, and the only thing I can get down him is protein shakes. I really believe that this is some side effects from the booster. However, I just wanted to see if any other caregivers had bad side effects with their LO's, and if so, how long did it last?