I am so very sorry that you have lost your mom. That is a huge event in a person's life. There is no diminishing the impact such a loss can have. A couple of years ago, I was visiting my student daughter in London. We were on the tube, and I was chatting. She told me to be silent, and to not make any general eye contact. She said that was an unwritten rule that she had heard somewhere. That made me feel so sad at the time, because her comment seemed to diminish and tarnish the picture I saw. Just a group of regular passengers, on their way, just like we were. I'm glad your fellow passengers reached out to you. I'm not surprised, and I am heartened, because I would have stepped up to comfort you, just as your fellow travellers did. And please don't feel embarrassed. There is absolutely no shame associated with someone's personal journey through grief, in all its manifestations.