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I am sorry to learn of this situation.
While it may make sense to look for other accomodations if the complex is inhabited by ill natured people and managed by mean spirited individuals, you do have a right to enforce the lease and your "implied warranty of quiet enjoyment" against the management.
To do this, you can file a small claims suit against the landlord (if the two are different, name the complex owner as the defendant, not the manager, the manager is the landlord's agent) for "breach of contract" (the lease agreement) and "breach of the implied warranty of quiet enjoyment" (the failure to enforce the rules regarding quiet, nuisance, feral cats, etc. on the other tenants).
You can also get a civil restraining order against the individual that is stalking you if you believe that there is an immediate threat of physical harm to you.