Sounds muscular. I had a doctor tell me that when it hurts to take a deep breath that usually means it’s a muscle.

Try some bio freez or something. Try a heating pad. I'd try a muscle relaxer or if not maybe advil . If heat dont help try ice. Or if to bad see your dr. Hugs and Prayers

Yes. I use an acupuncture mat and see a physiotherapy to dry needle the area to release tension in my muscles. Hot showers or baths can help too.