I tried searching for this already.
Cruising the forums, I've read from several posters that if an event says "A gate appears", that means to add a doomer. So this lead me to believe that Doom Tokens are the result of gates opening, contrary to my understanding that it is the drawing of a Mythos card that creates the token. So does that mean that if a Mythos card is drawn and a gate doesn't appear (which is instead a Monster Surge), a doom token does not appear?
If a Doomer appears during every Mythos phase, in addition to other events, that sucks imo because the game already seems impossible for me to beat. Thanks.

may the blights be with you!