Ok hoping someone may have advice which would be so much appreciated...

So I am very depressed. I used to think depression was a myth but after suffering panic attacks, violent mood swings- being totally in love with life one minute and then feeling totally hopeless and lifeless the next, I now know it is not a myth and was completely stupid for even thinking such a thing.
Well anyway, I used to be the life of the party but now I have withdrawn from friends, never go out, don't really give a damn about the way I look and really have become a bit of a nobody.
However I have never seeked medical advice and have done this for one reason.. the fact the job I am involved and subsequent jobs I hope to gain involve CAB checks which means a complete look over medical records, I can't risk being turned down on a job just because of depression and yet I am really struggling coping on my own. But I live for being able to get the jobs I've strived my whole life for... Please any ideas on helping myself beat this would be so much appreciated.

Candidate to be a governor of our state took himself out of the run 'cause of depression.
One would say that your health is more important. Also may be just seeing a councelor won't affect your work, you should really research it, I'd suggest you to talk to your insurance.
Meanwhile you can try something like support group, hobby, vacation.
My personnal experience with councelors weren't good and lot of my coworkers found them rather useless. May be it will work for you and your problem. Take finding right person very serious if you want to go this route.

That's excellent advice, I actually hadn't thought of a councillor. Thankyou.

I do tend to keep myself busy with hobbies- mostly with my sport team- but I seem to feel more and more uncomfortable in situations where we travel for games and feel less like part of the team. Very odd situation.
Had a holiday not so long ago too- but had the most horrendous panic attack and started hallucinating and felt so trapped that I was literally frozen to where I was in what I can only describe as a freak out. I have never done drugs and haven't drunk alcohol since January so this was a very alien experience to me. All at the age of 21- it's just not nice, I want to live normally.

But I will seek out a councillor asap. Thanks.

Be very careful about councelors. Read information on the internet how to find a good one. I'd suggest to go only to recommended people, ask your primary care.
Two people I had add to the "luggage" I already have, you don't want that.