I guess I can say I have a sensitive stomach so I'm thinking maybe antacids might help me but it would just take SN longer to absorb?
Many antacids contain Al(OH)3 or Mg(OH)2 or their combination. These substances are known for capability of reducing absorption of other substances, but I don't know how much they may affect absorption of NO2- in particular.
If the whole purpose of using an antacid is to prevent the undesirable reaction
3NaNO2 + 3HCl → 2NO + HNO3 + H2O + 3NaCl
that produces irritating substances NO and HNO3 which potentially may cause discomfort, then Al(OH)3 is probably not a good choice, because it may cause other funny chain of reactions where it won't be even consumed, working like a catalyst and producing NO and NO2 with nearly the same irritating effect.
Mg(OH)2 seems to be a better option, because the exchange
MgCl2 + 2NaNO2 → 2NaCl + Mg(NO2)2
doesn't look so bad at the first glance. Not sure about possible hydrolysis of Mg(NO2)2 though.