It would be very rare, but yes, you could suffer a Mallory-Weiss tear. This is a tear of the gastro-esophageal junction that is associated with violent retching or vomiting and in rare cases might be fatal.
Vomiting too hard.
A person can die from vomiting too much but probably not from vomiting too hard. If a person becomes dehydrated from vomiting, the body's electrolytes can become imbalanced which...
Possibly. But only because whatever was affecting the animals has a similar affect on us. Not to mention mess up our food chain and cause us to never eat meat. Animals keep everything in sync. so yes...
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