If no person or pet, if you are able, wrap your arms around yourself and hug. For me, when I had no one or pet, doing that has gotten me through some very tough times.
http://articles.mercola.com/sites/articles/archive/2014/02/06/hugging.aspx?e_cid=20140216Z1_SNL_MS_1&utm_source=snl&utm_medium=email&utm_content=ms1&utm_campaign=20140216Z1&et_cid=DM39620&et_rid=428467374