wednesday - muscle pain in the morning

Yesterday, after working out, I noticed a bit of soreness on the right side of my neck, like a pulled muscle.
I woke up at 1:30 AM with my back and right side aching. My side kept aching and waking me up all night.
Was it the workout? Was it the Rosuvastatin I take every day? Was it the tiny amount of gummy I had last night in an attempt to sleep? A combination?

9:00 AM weight: (WYZE scale)
114.9 lbs
34.1% Body Fat
71.0 lb Muscle Mass
21.1 BMI

Fit app: afternoon walk
35 Heart Points
1.92 miles
5,024 steps

What I ate today:
Letrozole 2.5mg
Ocuvite Adult 50+ multivitamin
two 600mg Calcium + D3 10 mcg (400 IU) supplement
1 OLLY Magnesium Gummy (336 mg Magnesium) (25 calories)
2 cups coffee with milk
1 bowl Hemp+Flax seed granola with kefir
1/2 cup roasted brussels sprouts + carrots
1/2 cup roasted potatoes
1 oatmeal raisin cookie
3 oz rotisserie chicken