First, are your PTSD is professionally diagnosed?
Do not self diagnose. It is called disorder because what you experienced causing disorder and/or happening more (intense, frequency, idk which your case is), and it has to be diagnosed by a professional. Self diagnose may lead to false thinking and getting you deeper in slump.
Also, I want to compare your experience with mine about traumas, as we have different results.
I have went through a lot of traumas, but I have not get any professional diagnosis. The safest one example to say is from an accident that broke my wrist, the one I use mainly for daily life. This put me in slump until today, because I haven't recover my abilities (drawing, writing) to the point before the accident. Does this hinder my learning? Yes. I learnt most effectively when writing down what I learn, and until today (it has been almost 3 years), I can't hand write more than 1 page because my wrist hurts. I draw very slowly because I keep miss my strokes and my wrist hurts as well along with me getting frustrated (I mean, it's still worse than the point before the accident).
But does this make me give up to learn draw or to write down things? No. I still write down things. I still love to sit down for hours and read to learn things. Conclusion, I think your desire to do things that require bravery and guts is not linked to PTSD, but then again, everyone's experience is different, and so does how one perceive their experiences and trauma. Regardless, we all moving on in our life, in the direction we are guided to or we choose. Do not give up. The life must go on. And as @GothickangelStudios says, be gentle to yourself as you recover.