A few things. First, the only tip I’ve even been given about getting rid of hiccups is drinking a glass of water upside down. As in, lips to the backside of the glass then leaning forward so far you can drink it. And you must drink quite a bit, maybe 300ml. Is this purely anecdotal? For me and those around me, yes, but maybe there is research about it. But it works for us, without fail, and it seems unbelievable even to me.
Regarding sneezing, I am currently discovering it has another feature where after having a few prosthetic discs inserted into your lower back via your abdomen, a sneeze also doubles as the world’s fastest impetus for suicidal ideation.