Generalised Anxiety Disorder. Anxiety unfortunately, is another symptom of Functional Neurological Disorder/FND and is something I personally deal with. For me at first found it hard to accept that feeling worried/upset about curtain things I have never done before hard. Ive gone from a very confident person to the feeling of being shut down. This is very common in young adults and effects 1 in every 6. So as you can imagine this is another strain on the NHS's funding. I have included a link at the bottom of the page which includes a help line for anyone who wants to speak personally to someone. I also as always offer anyone to message me directly on the page. Symptoms of generalised anxiety disorder Generalised anxiety disorder (GAD) can affect you both physically and mentally.