my dog used to do all that drama when he was a puppy. All dogs should go through that. It prevents separation anxiety, which can cause depression on dogs.
ego death is something people experience with pshychadelics but can happen some times with high doses of thc not very common, thc is psychoactive must have been some strong stuff to make one depersonalization/derealization but yeah never experianced it with weed before good to know tho