I was considering it, but I don't want to reduce stomach acid. Is there any other anti-serotonin substance similar and as cheap as cypro(aside from BCAA's-tyrosine and the dopamine promoters discussed here)? I'm looking for something that directly lowers serotonin, like cypro, not a reduction via dopamine promoters.
In lower doses of 10mg or even 20mg daily famotidine was shown to not affect stomach acid much and its anti-GERD effects are likely due to the protective effects it has on the gastric and esophageal linings. To start blocking acid production usually at least 40mg daily are needed and for some people up to 80mg.
As far as serotonin antagonists - there are quite a few and if you simply google for "serotonin antagonists" you will find a lot of links listing them.