( CNN ) -- Doctors for several people in New York suffering from a mystery disorder that led them to develop tic-like symptoms say their patients are starting to feel better . Out of more than a dozen who developed uncontrollable twitching and verbal tics , three say they feel completely better and six say they are significantly better , according to Dr. Laszlo Mechtler , medical director at DENT Neurologic Institute in western New York . `` The media focus , the questions on whether it is environmental or toxins , all that adds confusion , anxiety and difficulty , '' said Mechtler , who has treated some of his patients with psychotherapy and behavioral therapy , as well as prescribed medication for anti-anxiety , depression and headaches . A second doctor from New Jersey , Dr. Rosario Trifiletti , diagnosed some of the patients with PANDAS -- Pediatric Autoimmune Neuropsychiatric Disorders Associated with Streptococcal Infections -- and has been treating them with antibiotics . Lana Clarks , mother of one of Trifiletti 's patients , told HLN 's `` Dr. Drew '' that her daughter , Lauren Scalzo , has fewer `` headaches , stomachaches , no tic-ing and she 's been more energetic . '' Marge Fitzsimmons , 36 , who is among those who came down with the mysterious symptoms , says she is still experiencing some symptoms but feels much better and is soon expected to return to work full time . The incidents occurred in the small town of LeRoy beginning in mid-October . All of the patients -- with the exception of Fitzsimmons -- are students at LeRoy Junior-Senior High School . Doctors have diagnosed most of them with conversion disorder , saying that stress is the likely root of their physical problems . `` What happens is there is traditionally some kind of stress or multiple stressors that provoke a physical reaction within the body , '' said Dr. Jennifer McVige , a neurologist who has evaluated several of the teens . `` This is unconscious , it is not done purposefully and it 's almost like ... the stress wells up in your body has to come out in some way shape or form . '' The medical mystery in LeRoy has attracted the attention of activist and investigator Erin Brockovich , who came to the village of 8,000 people in western New York after learning about a 41-year-old toxic spill a few miles from the school . Brockovich and an associate suspect that the illnesses are related to the cyanide and trichloroethylene ( TCE ) that was spilled during a December 1970 train wreck . CNN 's Sheila Steffen contributed to this report .
Some of the high school students are feeling better . Some students on campus also are . The shooting occurred in the small New York town of LeRoy .