Helppppp

Pretty sure I pulled a muscle just under my breastbone. My son has 2 strollers, an umbrella type, and a massive one. The umbrella one was in the trunk so decided it was easier to take the giant one on a walk (twice🙄). I have to lift it up and over the gate so I did it 3 times. And then right before bed had like a crampy feeling. And then this morning it's so much worse. Mostly when I cough or make sudden movements thankfully. And feels almost bruised if I touch it. But what can I do to help it!? Will OTC meds work to at least relieve the pain? Doesnt help that I'm in my ovulation window so my boobs are so sore I could die lol.