I very much relate to intense stress due to work and not being able to work. It's no wonder your PTSD is more intense right now - stress will do that! And obviously, not being able to work, or feeling your ability to be able to work might soon be taken from you, it is very very understandable you are feeling more anxious / more symptoms right now.
I had a similar thing happen to me end of last year. Been struggling very bad with PTSD symptoms since July. Relapsed into my eating disorder severely in October. By December I had lost a quarter of my total body weight, and a Dr I had never met before, contacted my professional body (I'm a health professional) and did a formal notification, resulting in instant loss of my ability to practice. It's take three whole months to get back to work - even though I was fully able to work again for the past 6 weeks (weight fully restored). (Don't get me started on the notification, the way it was done might be legal but it was INCREDIBLY unethical and done with no compassion whatsoever ;( ).
All it did was add incredible financial pressure - I might still lose my house in a few months. I had a full caseload and due to being off for so long, I have had an 80% reduction in income for the next several months. Not to mention huge loss of self esteem, fear, paranoia, humiliation, 'everyone knowing' I had lost my ability to work due to mental health issues.
It was no surprise then, my PTSD symptoms got a LOT worse with all the additional pressure. I've only been back at work a few days, and whenever I find myself thinking 'I need to stay well, I cannot afford to take ANY time off or I will lose my house', I of course, get more intense anxiety - and more PTSD symptoms.
The only thing that helped in anyway during this time, was having a T who trusted me, believed in me, and let me rant and vent and talk about HOW UNFAIR it all was. She believed in my ability to get back to work, when I certainly did not.
My going back to work depended on the very group of doctors who had behind my back, spent 3 weeks planing to do a notification to my professional body, without ever mentioning they had ANY concern. The sense of betrayal and broken trust was intense - not to mention my utter disrespect and ANGER at them for 'doing it to me' (the way they did). For the past 2 months I have had to 'act as if' I trusted them, all the while panning on discharging myself the minute I was able to return to work. I have since changed providers (at great cost to me), and am finally feeling a degree of 'control over my life' again.
So I do understand the utter powerlessness of the situation you're in at the moment.
Another thing that helped me was to try (very very hard) to focus on 'what I CAN do' - and pretty much 'turn a blind eye' to what I had not control over. I had no control over if or when I was allowed to return to work - but I did have control over doing all I could to get well - or at least well ENOUGH - to return to work.
Whenever I feared 'I will lose my house!' I held onto what my friend said to me when it all first happened 'You're not losing your house THIS week'. I still need to tell myself that - and it does help.
I wish I had better advice or suggestions, but I don't - I do hope you have a T you trust, someone to talk to about what is happening - and that hardest thing of all - don't let the anxiety take over you completely - you fear not being able to work soon - but for NOW, if you are working, that is a positive. Try as much as you can, to let future fears stay in the future - many of them don't end up happening anyway.
As for fear you won't be able to work - yes, a very genuine fear - but can you see, the fear will only feed the PTSD symptoms and then if they do get worse, it almost becomes a self- fulfilling prophecy ;(