NOT A DOCTOR
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I wouldnt worry too much, Ibuprofen is a pretty weak drug: like basically every over the couter drug, the dosages you get are hard to do yourself any harm with, and long scary side effect lists are there for general arse-covering if sued. Most of the responses are unlikely, especially the more severe ones. Its a numbers game. The vast majority of people get no side effects, those few that do dont get to sue anyone.
And, yes, ibuprofen, paracetamol and asprin are indeed all different. For that reason, you can stack em up for pain relief. Not sure if the same applies to asprin and ibuprofens anti-inflamatory properties.
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NOT A DOCTOR.