Thanks for your question on Health Care Magic. I can understand your concern. By your history and description, in my opinion you are mostly having muscular spasm due to uncomfortable position on recliner chair. Muscular spasm is common in chest area after reclining position. Throbbing pain in upper chest area is also suggestive of muscular spasm. So avoid heavyweight lifting and strenuous exercise. Avoid movements causing pain. Apply warm water pad on affected site. If not improving in 1 week, you may need painkiller and muscle relaxant drugs. Since these are prescribed medicines, you need to consult doctor for their prescription. Hope I have solved your query. Wish you good health. Thanks.