Disclaimer: I am not breathless, dizzy or lightheaded, not sweaty or clammy, no pain in jaw or arm, PulseOx finger monitor has me comfortably at 97-98% oxygen and a steady heart rate of 69 (immature snort), no sense of doom, etc. If I had any of that or was in any other way worried then I'd ring for medical attention.
I've had costo before and it's both uncomfortable and annoying. On Tuesday I made the mistake of doing some heavy lifting and what have I done? Set of another bout of it. Fucks sake.
I had some niggles yesterday that made me wonder then today it's started in earnest. A sort of stabbing/jolting behind my lower left breast, so around five or six ribs up from the bottom. Worse if I'm walking around but goes away pretty much immediately if I stand still or sit down. Pressed there because I can't leave well enough alone and gave myself a shooting pain (again, it went away as soon as I stopped pressing). Some referred discomfort a couple of inches below my armpit along the same line of ribs and occasional twinges in the bottom of my breastbone. It more or less goes away if I take my bra off and don't have the underwires pressing any more and goes away entirely if I lie down unless I'm lying on my back, then it's uncomfortable again.
Fun times and it really does a number on my PTSD so I'm fairly tweaked too 
Anyway.
I'm maxed out on anti-inflammatories and can't take any more until around 9pm, they're also upsetting my stomach so im trying to be sparing with them.
Any tips for relieving the discomfort? I've already jettisoned my bra but I've got to go out later and would like to not spend the whole time rubbing my chest. Had a hot bath earlier which helped a lot but I can't lie in the bath all evening.