I agree with Muffy and the fact you're not sure what is triggering you will make you more anxious and cause a vicious circle .... getting overwhelmed now won't help you sweetie, please take good self care right now.
To answer you question yes focus is so hard in PTSD mode .. forgetfulness, foggy, can't remember what was said two minutes ago yet memories from long ago are vivid ... learning to sit, breathe, think in the now are so important .... if your coping methods aren't working please try to see your T or even just call, e.mail anything to get some help .... you're not alone in this, you need to ground yourself, get a sense of middle ground .... please take care and let us know how you are doing. Safe hugs if that's ok? Ophelia xx