Is this a symptom a PTSD?

Firstly PTSD is most likely when there is a sudden intense experience of threat that we cant really react to at the time, so we get stuck, feeling the intense anxiety even when the threat is gone. However whatever you call it the experience of a life threatening illness has a profound effect on people. We all like to think of ourselves as having some control, being capable of dealing with things and having some self confidence. We also like to feel as if life is fair and at least in some ways predictable. The in one fell swoop all the beliefs we have about ourselves and life are kicked from under us. You face something that you cant influence or even understand you become dependent on others you are anxious about the future. I'm surprised you even feel that your feelings might be abnormal, you have in effect to rebuild your whole belief systems. Your first job is to go easy on yourself, you have had to deal with a lot, give yourself time and don't expect to much of yourself. Its important that you reestablish your relationships and don't drive people away, anxiety does make you angry and irritable but the odd thing about situations like this is that its up to you to set the rules for people. Many will simply not know what to say to you and feel uncomfortable, you should introduce the subject of your illness, this gives others permission to talk about it, but you need to limit how much you talk about it, it can frighten people. It just makes it easier and less awkward. Social anxiety is strange isn't it, if you knew some one who had been through what you have and was feeling unsure and anxious, would you be wanting to make them feel worse? I doubt it, people would generally want to be as supportive as possible. These feelings do tend to improve with time but getting some help is usually a good idea, having a neutral person to talk to can really help.

There is one sure way to find out…. You will need to see a licensed therapist that will ask you a bunch of questions. Other things it can be is anxiety and I am sure other things too.

I would just encourage you to see some one that can provide the answer you want and explain what might be going on.

I hope you get to the bottom of it and that they can give you some suggestions on how you can stop it.