Of course, you always have to be concerned about hijacking. But with the measures that are in place right now, I'd say that probably the airways are as safe as they've been in a good number of years. ↗
And if doctor says that you don't have IBS with constipation, you might want to get a second opinion, because I had doctors that were telling me... of course, a lot of this has to do with science - progressing. ↗
Every profession will have its rogues, of course, no matter what oaths are sworn, but many health care professionals have a real commitment to serving the best interests of their clients. ↗