Hey Bry...I'll bet you
that work you did in your yard is exactly what happened.
I am the same way about going to the doctor but this last time I was kind of scared with being short of breath...
Have you tried the heating pad ?
I use mine like a toddler used their blankie..LOL...I put it wherever the pain is including on my chest.
I did get prescription strength Advil and took a few for a few days....it makes me a little nervous because they can be hard on your stomach but the pain made me nervous too and it hurt !!
I also am the same as you in that I just can't sit too long.
I have a very physical job and am a stickler about how my job is performed, so I get right back into it and too soon sometimes as well.
I know muscles need time to heal but who the heck has time ?? !!! LOL
Talk to you soon ..get well, and rest if you can ..and get close to a heating pad !!!