As for the long term health effects of surveillance, we got Das Leben Der Anderen (The Lives Of Others) [1] already but additionally I'm anticipating seeing that covered in the documentary The Feeling of Being Watched about Operation Vulgar Betrayal. Quoting the About page [2]:
"In the Arab-American neighborhood outside of Chicago where director Assia Boundaoui grew up, most of her neighbors think they have been under surveillance for over a decade. While investigating their experiences, Assia uncovers hundreds of pages of declassified FBI documents that prove her hometown was the subject of one of the largest counterterrorism investigations ever conducted in the U.S. before 9/11 – code-named “Operation Vulgar Betrayal.”
With unprecedented access, The Feeling of Being Watched weaves the personal and the political as it follows the filmmaker’s examination of why her community fell under blanket government surveillance. Assia struggles to disrupt the government secrecy shrouding what happened to her neighborhood in the 90’s and probes why her community feels like they’re still being watched today. In the process, she confronts long-hidden truths about the FBI’s relationship to her community.
The Feeling of Being Watched follows Assia as she pieces together this secret FBI operation, while grappling with the effects of a lifetime of surveillance on herself and her family."
Documentary is scheduled for 2018. Kickstarter page [3].
[1] https://en.wikipedia.org/wiki/The_Lives_of_Others
[2] http://www.feelingofbeingwatched.com/about
[3] https://www.kickstarter.com/projects/beingwatched/the-feelin...
Surveillance drones are quiet and fly high enough they can't be heard and are hard to spot. The only reason to fly them low enough to be heard or seen is for intimidation.