PTSD in D&D5e

This feat focuses on giving people an accurate way to portray PTSD and C-PTSD in a D&D friendly way 

Keep in mind all of this is very flexible, and your DM could and should make adjustments if they see fit to the effects as you talk about playing a character with post traumatic stress disorder. 

PTSD IN DND 5e
Trauma in D&D is very common, and sometimes that trauma can show up differently and affect people in different ways. Post-traumatic stress disorder (PTSD) can develop after a very stressful, frightening or distressing event, or after a prolonged traumatic experience.

It is up to you if your character has PTSD, and what it relates to. Some ideas might be are ; Did your character serve in the military and witness the horrors of war? Was your character subject to the abuse and neglect of a run down orphanage as a child? Or maybe they witnessed an attack on their village and was left feeling isolated and alone after the trauma.

Consult with your DM on this, and discuss the events of the world your character will be inhabiting, and what might be the root of your character's traumas.

Keep in mind as you play this character, PTSD is also often accompanied with responses to these stress responses, such as somebody might have to carefully check over every surface of an inn room until they deem it safe to sleep in. They might avoid people, places, foods, clothing, etc, in an attempt to avoid feelings and memories of the event. People with PTSD also can often display self destructive behavior, such as smoking, drinking recklessly, or just even being generally unsafe.

EPISODES/ SYMPTOMS

PTSD 'episodes' as I refer to here are when a major trigger has been set off, and your character experiences symptoms more severely/heavily. This can often be when a character is prone to flashbacks (both flashbacks to memories of the event, but also even FEELING like they are back in the moment of the traumatic event, and reliving it over)This can cause your character experience numerous symptoms all at once and much stronger than they usually might, when something triggers an episode, roll 3d20 on the Trigger Contact table. (Your DM might also decide that said trigger instantly triggers an episode)

PTSD symptoms can vary in intensity over time. You may have more PTSD symptoms when you're stressed in general, or when you come across reminders of what you went through. For example, you may hear a car backfire, or fireworks going off, and relive combat experiences. Or you may see a report on the news about an assault and feel overcome by memories of your own assault.

Your character may be more on edge, potentially giving them a bonus to Perception or Survival relating to checks to perceive things or avoiding things relating to specifically your trauma, for example, your character might get a bonus to perceive a fire that has broken out quicker than their party members, or perhaps even noticing somebody following behind them easier than another.  Talk with your DM about how your character's skills with perception / and or survival  might have been changed, and what bonuses they might/ might not gain to their abilities.

TRIGGER

Triggers tend to be things that remind a person of their experiences, like a victim of a dog attack may struggle to be around dogs for the rest of their life.
Somebody who has experienced combat and developed PTSD might be triggered by loud yelling or the sound of fireworks.

An individual who has PTSD from a destructive fire might smell smoke and panic, or see something on fire and become frightened.

Those who have experienced abuse might struggle with confrontation and panic whenever the need for confrontation arises, they might flinch when hit more than one typically might.

Roll a Wisdom Save (DC set by DM depending on the trigger & its correspondence to the event, depending on your DM you might have to roll every time you fall asleep), on a failure, roll on the table below when your character comes into contact with a trigger, and act accordingly. Also, keep in mind, your DM might just tell you what is happening to your character, depending on what you would have discussed with them before)