Agoraphobia? im pretty sure.
One milder, but longer lasting and even more troublesome, difficult to eradicate and treat, version of this "phobia" can be described as "fear of overpopulation", which not necessarily refers to immediate physical menace or presence of crowds, but to the looming and permanent presence of such crowds competing for resources (air, water, natural environment), making them scarcer and more difficult to get such satisfiers, than they could be otherwise if no human overpopulation exists.
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Agoraphobia. This is the fear of being caught alone and helpless in difficult or awkward situation whether outdoors or in crowded places.
There is Ochlophobia, Demophobia, and Enochlophobia. Either way they all mean the fear of crowds. Hopefully this helps :)