I have anxiety. It isn't just feeling nervous. It's all an encompassing fear that I or someone I love is in inmmenet serious danger either from me or someone else, 24/7, and it makes me tremble, sweat, vomit and I bite my forearms until they're bruised (have permanent nerve damage) or burn them/scratch them until I feel 'grounded'. I've spent my life from age 16 in and out of outpatient psychiatric care and have had several loads of counselling.
It isn't just feeling frightened of an exam, a medical appointment, that's normal. I cant even sit and watch the fucking TV some nights because I'm so frightened I'm in immediate danger of developing some sort of serious health condition. Standing in a supermarket, railway station, shop, next to a busy road, terrifies me. I take pictures of every plug in my bedroom and check 3 times that I've turned off everything. I've been 30 minutes on a bus and gone back just to check my cooker is off. That's an anxiety disorder - when a normal emotive response becomes so hard wired you feel it 24/7.
I don't tell people because I'm scared they'll laugh - so I bloody hide indoors instead and say I feel ill. I have chronic pelvic pain, which they think anxiety makes worse, but I self medicate the anxiety with codeine.
My mum is a very anxious person, takes psychogenic seizures, has had ECT and post traumatic amnesia. My gran doesn't leave her house much. My other gran took her own life. Several relatives been inpatients. I think it's a learned response from life events and mirroring what you see (my mum never left the house when we were kids and I believed there was something out there we should be frightened of - my mum had good reason to be scared, with me its more irrational).
You can manage it though to some extent. Very, very, very difficult but I've managed to hold down a FT job, move home, just need a lot more help doing so than other people do.
My grandmother said I'm lazy and I'd be a bad mother because of the anxiety - I don't agree with either of those.