Causes:
Any experience of problems I'm not sure how to solve while performing a task for my employer. Doubts about the clarity of the instructions or the acceptability of my results.
Unexpected changes to my routine or to my immediate environment.
Working against the clock and being late or realising that I'm putting off a difficult task.
Close involvement of others in my work.
Presence of authority figures.
Crowds and noisy, disorderly public gatherings.
Recognition that I'm running a risk of something significantly nasty happening to me.
Partners showing any sexual interest in other guys.
Partners dressing in an over-sexualised way in public.
Other guys showing any sexual interest in my partners.
Loved ones in danger.
Loved ones going missing, even if it's only for an hour.
The act of challenging another person's behaviour, especially when the outcome is important.
The thought of declaring a strong attraction towards somebody who may not be attracted to me.
Making small talk.
Walking past rowdy teenagers and thugs.
Telling lies.
Breaking rules (even very petty or unjust ones) when there's any chance of being found out.
Symptoms:
Fluttery feeling in stomach.
Shaking hands.
Sudden, jerky movements.
Jittery, confused thinking or blanking out.
Overheating.
Inability to dismiss the problem and enjoy the rest of life.
Exagerrated sense of danger.
Difficulty accepting comfort from others unless it's very specifically tailored to my problem.
Negative attitude.
Insomnia.
Consuming unhealthy drugs and foods.
Solutions:
Avoiding the causes.
Toughing it out - often if I realise what's going on, I can just steel myself and drive through the anxiety, particularly if I can calm down long enough to work out a coherent defense plan.
Breathing exercises.
Physical exercise.
Doing something scary that won't be dangerous for very long - paradoxically, once the adrenaline rush has gone down, I feel very relaxed. Rollercoaster rides are quite good for this.
Telling somebody about what's freaking me out - I don't find this easy, and usually there's nothing much they can do to help, but just knowing that I've shared it can put it into better perspective, and the feeling that at least one other person is truly sympathetic to my plight can ease the problem.
I suppose stimming comes into it as well, but all my stims are practically invisible, I barely notice when I'm doing them and I have no idea whether or not they help to calm me down or not.