I'm not chiming in on the toxicity or lack thereof with apricot seeds in particular, because I don't know. I do know that not all plant toxins will immediately make you feel bad or give you obvious negative reactions. There are plenty of toxins that slowly and quietly impair and damage organs to the point of seemingly sudden organ failure after weeks to years of repeated exposure. So don't just judge by how you feel now whether something you're eating is dangerous. Do lots of research, and don't discount studies from more mainstream sources as definitively bogus or just profit motivated out of hand.
I agree that one should not rely on how they feel to determine whether something is good or bad, but instead to research and most of all use their own mind to THINK. I tend to never trust mainstream sources because it's mostly always biased, and instead take it with a grain of salt.
To me, it makes no logical sense to worry about ingesting seeds. Of course, if one consumes too many, it can be toxic...just like consuming too much water is dangerous.
I think a big reason medical literature is making a big deal out of seeds is because there is alternative cancer treatments that involve them. That threatens their business, so they scare you into not getting the treatments by claiming you will die.
I know you're not claiming anything, so what I wrote is not aimed at you. Just sharing my thoughts.