Hi Alex
I suspect a home built electrolysis unit is a bad idea. You need to vent the hydrogen so that it can't collect in a high area, and I am reasonably sure it has a wide range of concentration were it is genuinely explosive - blow the roof off style.
Also, acid is usually used in the electrolysis solution, and you have to be confident of scrubbing that out before breathing the gas in. If you don't, then I suspect you would rapidly have even more trouble breathing!
Philip
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