You can review VA disability benefits eligibility criteria to find out if you can get disability compensation for an illness or injury caused by or got worse during active military service.
What are considered presumed disabilities?
Presumed disabilities are a chronic long-lasting  illness that first appears within one year after discharge or caused by contact with contaminants or other hazardous materials or an illness caused by time as a POW.
another question for you regarding How will I get these benefits? What Should I Do When I File A Disability Claim?
When you file a claim you must complete one of these additional forms:- A statement in support of the service connection claim for post-traumatic stress disorder VA Form 21 - 0781.-Download VA Form 21 - 0781 PDF or
Can I get VA disability benefits?
You may be able to get disability benefits if you have symptoms related to a traumatic event, the stressor, or your experience with the stressor is related to PTSD symptoms.
What requirements must I meet?
a requirement must be that the stressor occurred during your service
if the traumatic event occurred during my service
Can't you function as well as before because of your symptoms?
if due to the symptoms I cannot lead a normal daily life
A doctor has diagnosed you with PTSD?
not yet a doctor has not diagnosed me