Based on your drinking record, I would say you can rule out just having a weak stomach, so the food after smoking can pretty much be ruled out.

http://www.erowid.org/plants/cannabi..._effects.shtml

At the bottom they list nausea as a possible negative side effect (cannabis is often used to alleviate nausea in but everyone reacts differently). You may be one of the few people that experiences nausea from marijuana. Apparently you had a rather extreme reaction. If you really want to persue it, give it another try with a smaller does. Meaning don't get high grade stuff and don't smoke so you get totally fucked up, just get a mild buzz and see if you feel sick. Maybe having an OTC anti-nausea drug (I assume these are available. I haven't bought/used pharm drugs in 8+ years) handy wouldn't be a bad idea.