Well, If someone made a comment like "walking 20 feet would kill me " as you said, you made this comment,
he said, in response to my comment about how walking 20 feet would kill me, "We're worried about you."
Even if the person was just a casual acquaintance, a comment like that would worry me, Is your health that bad ? I mean, walking 20 feet, is not something that should kill a normal healthy person, or even be difficult, I would be be very worried about someone that could not handle walking 20 feet. More so if it was someone closer to me like a employee, or family member,.. And then , combined with, if I noticed the person, crying, ....If the "boss" did notice that,..If you have a lot of problems, and your health is so bad you can not walk 20 feet, and then you are crying over small problems at work like a "coding problem" these are things that would worry the management, they may be concerned that any time now, you are not going to be able to work, or "cope" any more. Yes you should be worried, they may be looking for a replacement, in case all of a sudden you can not handle the job any more. If you were just joking when you said it would kill you to walk 20 feet, then you need to clear that up, and let the boss know, you were just kidding, The crying thing, I don't know, if that is something that does not occur often, probably it is a "non issue", but I do think you should clear this up with your boss, assure him your do not have any health issues, every thing is ok, etc. Unless of course, there are problems with your health, etc,.. then the same , still you should be upfront and advise them, you can handle walking 20 feet, and soon you may not be able to handle, walking from your car to the office entrance, this is something to be concerned about. Maybe you just need to be more carefull about what you say to the boss,and control your emotions better.