I was having tinned mackerel in tomato sauce on toast and all of a sudden I felt a horrible sharp sensation as I swallowed a bit. I am sure it was a bone and now I am getting paranoid I.e. not breathing properly and getting a bit sweaty! I'm sure it's just my stupid anxiety causing these symptoms but can it do any harm if I've swallowed it?? I wish I had mashed it a bit more now but I have occasionally encountered sharp bones in it before but managed to pick it out before I was able to eat it.