Day 2 here and the muscle aches are the worst part of it. Otherwise it's just a sore throat and low temp (95.5).
Looking at the symptoms, those listed for "omicron" and the seasonal Flu are identical:
C19:Fever or chills
Cough
Shortness of breath or difficulty breathing
Fatigue
Muscle or body aches
Headache
New loss of taste or smell
Sore throat
Congestion or runny nose
Nausea or vomiting
Diarrhea
Flu:
fever* or feeling feverish/chills
cough
sore throat
runny or stuffy nose
muscle or body aches
headaches
fatigue (tiredness)
some people may have vomiting and diarrhea, though this is more common in children than adults.
*It’s important to note that not everyone with flu will have a fever.