All of these things you describe are very real but they’re not physical withdrawal symptoms, but indeed psychological. The mind is a very powerful thing, so these effects can be very powerful, I’m not trying to dismiss your experience. However they are not the same as for example withdrawal from heroin or heavy alcoholism, both of which create actual physical pain and potentially death.
Every individual is different too, so people sharing how they can be heavy smokers and stop while on vacation for a few weeks without issues aren’t trying to dismiss your experience, just like how you shouldn’t dismiss theirs.
I’ve known physical withdrawal in the past and am a daily smoker now, I’m also one of those that can just stop on vacation no big deal, but I seldom skip a day at home.