I've only just noticed this thread, so thought i'd contribute with a few of my own issues...but first off I think this thread is a fantastic idea, full of fantastic people.
After moving schools for sixth-form I suffered from Anxiety which then led to depression, which led to me skipping the bulk of 2 years for school. Nothing really helped, as it was a social problem for me - not a chemical imbalance. I'd feel awkward talking to new people - as I've been brought up as a "speak when i'm spoken too", so starting conversations didn't come natural to me. There'd be occasions when i'd sit in silence shouting at myself or pinching myself when I knew I should have spoken. The easy option was to skip school.
Fortunately, I passed my A-Levels and went to university - where it was the same issue once again - and I ended up skipping the bulk of University. It's worth while saying at this point my depression sub-sided as I had learnt to cope with it a bit more, and look at life with a different perspective, but the Anxiety was still crippling. My final year of university I had been warned several times for skipping classes due to this. Fortunately, my tutors didn't let me take the easy way out and I ended up graduating.
The more I've grown up the more confident I've became, but social anxiety is still something that I really suffer from to the day. Recently it has been a massive issue in my life as I have started a new job in the past 3 months. My previous company was fantastic, it was a small company with people who I could talk to and have banter with, with no issues. My new company is a large organisation, and whilst I'm part of a big team - my role is the first of its kind which means I'm quite excluded in that I don't have anyone to ask for help, and I'm not really part of any group. This has really triggered my anxiety as it means i'm pretty much sitting in silence all day, when people go out I feel like I have no right to join them as I've not really spoken in the past, and as per back in 6th form, i'm sitting there screaming at myself to talk but not being able to.
This all means at the end of the day i'll go home, visibly shaken - wondering why I can't just strike up conversation, angry at myself - and scared that If I don't change something I may not be able to progress career wise as I don't have those tools of conversation to initialise something. That said if someone talks to me I can talk for as long as I want.
Anxiety can be crippling for me some days, but - at the same time the days when I overcome these obstacles can be the days which are the highest.