So an issue that I have that almost got me into trouble a moment ago is I have a problem with getting angry at people when I'm in the middle of doing something and they interrupt me.

Here's an example: I've been busy most of the day aside from the brief period where I was posting on PC earlier. I've been working and studying most of the day since I got up at 8 AM and I just got home about 20 minutes ago.

Not even 5 minutes before I could even enjoy a cup of coffee or eat the maintenence man comes banging on my door which anytime somebody bangs on my door loudly like that it triggers my PTSD which causes me to go into pure survival mode where I'm ready to fight somebody.

So anyways, the maintenence man wants to spray again for bed bugs at the very last minute after I just bug bombed myself today when I didn't even put a freaking order again so I run to my door after his loud banging and start yelling saying things like who the **** is there and leave me the **** alone and stuff like that which happens when I am triggered by somebody making loud banging noises or acting aggressively towards me. If the guy didn't identify himself I was ready to pull a knife on him in fact. The guy looked rather terrified of me because he was all like "I just wanted to spray for bed bugs I will mark it as done" and what not while looking like he wanted to get away from me as fast as possible.

Even if I did put an order in, it still makes me angry when they won't give me a freaking heads up before coming over to spray or perform any task that would require me to leave for more than 2 hours especially considering the fact that I don't drive so coming over expecting me to leave for up to 4 hours at almost 4PM out of the blue without ample time to prepare is asking too much out of me and since most of the bus routes where I live close down at 7PM if I went out to do something I would have to find my own way home.

How dare they.

While I'm usually not this bad, this is just one extreme example of how I can get when somebody interrupts me when I'm in the middle of doing something. It doesn't typically happen when I'm doing some kind of work on a team with other people and I'm generally not violent or a threat to people but when I'm off the clock you better leave me the hell alone because if I'm playing my game or studying or something and I have to drop what I'm doing when I'm having my "me" time to deal with you, you are not going to like me.

How can I tone this down a bit?