A lot of food poisoning is actually caused by the salmonella bacteria (as well as others).
Raw chicken is a big source. You should not use the same knives you cut raw chicken with or cutting boards for chicken with anything else unless you really wash it well in hot, hot water and soap! Also poultry should be cooked through.
In severe cases, there can be fever and sweat but the gastrointestinal symptoms are usually present in all cases.
Yes, it sounds like you've had more than your share of salmonella poisoning! I don't know of anyone immune to it, so hygiene is key. I don't think you can pass it on easily to other people (unless you're preparing their food after dealing with your turtle!)
Glad you learned something useful!

Your guts will thank you for it.
