Tearing up in public.

Well, there was this huge fight in my home and my mental health was literally fucked up for the past 2-3 months, so... I did what I usually do, went to my favorite chaat wall shop near my street, and went there to eat, there was this lady, possibly in her late 20s in the next table. I went there, I was eating and well...I teared up gang, this lady looked at me, and moved out of the entire place and moved about 20-30 Metres away, and I felt so embarrassed at left the place. So, what exactly should a person do if he/she tears up in public and what should he/she do if someone else is tearing up in public.