That sounds like an acute stress reaction brought about by chronic stress. The diagnostic criteria of PTSD include a latency of several months or years from the traumatic event(s) and the first appearance of symptoms.

The symptoms of PTSD generally include hypervigilance (checking your six all the time), restlessness, sense of impending doom, rumination (fixation of thoughts on the traumatic events and retributive fantasies), nightmares, feeling more tired after sleeping than before, loss of appetite despite being hungry, lack of concentration, anxiety and depression.