your first post...

"Is being easily irritated/annoyed or even having a more serious disposition than most people you know normal or (more) common for people with PTSD?"

answer in general no. anyone can feel any amount of being irritated /annoyed or more serious in your words disposition than someone else... feelings are not something you can put on a one shoe fits all and if you feel more its such and such disorder.

feelings/ emotions and moods and individualized based on ones own body, experiences, memories and so forth. even how someone is raised can determine how much emotion and disposition a person has.

PTSD is a mental disorder that is trauma related. a person witnesses or goes through a trauma or knows someone close to them (sister brother, bff and so forth) that has gone through a trauma.

the problems associated with PTSD (anxiety, mood problems, nightmares, flashbacks and so forth) are related to the truama.

heres an example...

I can get irritated and show that in my mood, body language.... because of people places and things where this irritation and so forth isnt related to my traumas..... this is considered normal.

On the other side of the coin if I get irritated and so forth because I see someone that looks or sounds or smells like one of my abusers... this is called PTSD.

another example..

I can be taking a walk and a car horn beeps and I startle get irritated. this is normal. people in general do have a startle and irritation reaction to an unexpected beep of a car horn, or traffic

on the other side of the coin I can be out taking a walk and hear a car horn identical to that car of my abuser and have the startle / irritation reaction. this is PTSD

one more example

I can be sitting in a hospital er with one of my children and feel uncomfortable and this is normal, no one really like emergency rooms, the wait time, long lines and so forth.

I can be in the hospital ER with one of my children and see a security officer with their side arm and feel uncomfortable, remembering the trauma I witnessed while sitting in a hospital ER. This is called PTSD.

my point is if your feeling irritated and your disposition changes is directly connected to a trauma its ptsd.

if you are feeling irritated and so on but its not connected to a trauma its not PTSD.

if during a trauma your mom was talking too much, people were riding past in loud cars/ motorcycles and planes were flying above your house during your trauma and now those things cause you to have intrusive thoughts, flashbacks and anxiety because they are connected to the trauma situation then yes its PTSD.

also there are many things that cause a person to have problems with people talking too much and loud noises. one of my siblings right now is going through menopause and has these problems. my daughter has mental and physical health challenges (childhood schizophrenia/ autism among other problems) that cause her to be sensitive to noises and voices, people places and things.

my suggestion is talk with your treatment providers, they will tell you if your irritation and disposition is related to your trauma's (PTSD ) or other things that may be causing this.