What is the diagnosis and recommended treatment for a 3.8-year-old patient presenting with sudden onset complex motor tics, suspected to be related to Pediatric Autoimmune Neuropsychiatric Disorders Associated with Streptococcal (PANDAS) infections, given a family history of psychiatric disorders and a sibling's history of PANS-like symptoms?

Transient Tic Disorder: This diagnosis is the most likely due to the sudden onset of complex motor tics in a previously healthy child, with no clear evidence of an underlying neurological condition. The tics have been present for a relatively short period, and the child's symptoms have not significantly impacted her daily life.

PANDAS (Pediatric Autoimmune Neuropsychiatric Disorders Associated with Streptococcal Infections): Given the timing overlap with the sibling's confirmed strep infection and the child's symptoms, PANDAS is a possible diagnosis. However, the lack of elevated strep antibodies and negative strep tests make this diagnosis less likely.
Early Chronic Tic Disorder: The child's tics have been present for several weeks, and there is no clear indication of a transient cause. This diagnosis is possible, but the child's age and the relatively short duration of symptoms make it less likely.
ADHD (Attention Deficit Hyperactivity Disorder): The child's symptoms of impulsivity, high energy, and emotional reactivity could be indicative of ADHD. However, these symptoms may also be related to the tic disorder or other underlying conditions.

Neurodegenerative Disorders (e.g., Huntington's disease, Neuroacanthocytosis): Although rare, these conditions can present with motor tics and other neurological symptoms. It is essential to consider these diagnoses to ensure prompt recognition and treatment.
Infectious or Inflammatory Conditions (e.g., Lyme disease, Sydenham's chorea): These conditions can cause neurological symptoms, including tics, and may require specific treatment.
Toxic or Metabolic Disorders (e.g., Wilson's disease, Mitochondrial disorders): These conditions can present with a range of neurological symptoms, including tics, and may require prompt recognition and treatment.

Tourette's Syndrome: Although there is no family history of Tourette's, it is essential to consider this diagnosis, especially if the child's tics persist or worsen over time.
PANS (Pediatric Acute-onset Neuropsychiatric Syndrome): This condition is similar to PANDAS but is not specifically associated with strep infections. The child's symptoms, including emotional reactivity and sensory-seeking behavior, could be indicative of PANS.
Other Rare Neurological Conditions (e.g., Moebius syndrome, Stiff Person Syndrome): These conditions can present with a range of neurological symptoms, including tics, and may require specific treatment.