Intense back ache with the flu?

Normally I’m extremely healthy and only get the flu every two years or so. I had the flu earlier this month, lasted about a week. This past Saturday I came down with extreme body ache, migraine, chills, zero appetite and fever just under 102. Tested negative for Covid and urgent care confirms flu.

Finally fever free this morning, however the body aches have turned into extreme middle(across the shoulder blades) and lower back pain. I felt this for about 24 hours with my last flu, but this has been a couple days now. I tend to have a very high pain threshold but this has floored me. Also I have zero cough or chest congestion.

So I’m curious to hear if others have had similar experiences with the flu going around this season? How long did the back pain last for you?

I’m a full time bartender, spending 50 hours a week on my feet, and my back definitely has just been worn down over the years from that. Does the inflammation from the fever/ other biological mechanisms during a flu target the muscles you use the most?

33 female and I feel this has aged me 30 years. There’s no way I can return to work in this much pain, any shared stories would be appreciated!