Pain under left shoulder

Baby 312
I've had pain under my left shoulder blade since Wednesday....Monday and Tuesday I didn't have any BM, so I'm thinking it's trapped gas....which I've had before. Usually it goes away after a night of sleep but I still have it! It's pretty painful to the point it brings tears! Anyone else experience this? I'm 33+5 weeks. 
Advice? I've tried cow pose, bath, chugging a small soda and massage.
Also--hopefully unrelated but I threw up this morning. My first thought was, "ugh I hope my morning sickness isn't back"...then I realized that I took a mylanta chewable on an empty stomach. Hopefully I don't throw up again tomorrow. 

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