Gaviscon is over the counter seaweed based gloop that is meant to put a "floating layer" over the top of your stomach, as a barrier between the acid and everything above the LES.
Over here in the UK pregnant women use it a lot, though there are worries about the aluminium it contains (well some people worry........ I was too sick to worry!!). I use it occasionally now, but I don't think I could face it if I was feeling a bit pukey - I can't say if that's because it really would make me more sick or whether it's just the memory of the endless pregnancy vomiting..... (well obviously it did end after 9 months........!!).
Salt water would definitely make me feel sick too!!
You tried aloe vera?
New stuff: GERD. Interstitial Cystitis
Lifelong stuff: Food allergies, eczema, asthma