Jarry,
Try to be positive? I know people who have survived the most horrific burns and they still manage to get out. The fresh air will help too. I wouldn't worry so much about the cosmetics of it but the fact you may well have an infection? Three weeks is too long to wait.
If you could afford the tattooist I'm guessing you are not broke?
Go see a doctor as soon as possible regardless of anything else as the last thing you need is this getting worse.
As for the tattoo 'artist'? I wouldn't go anywhere near them without seeing your doctor first.
Even then only contact them via a lawyer.
They should never of touched you with this condition.
That said maybe you begged them to? I really don't know but it wasn't a wise move on your part to have it touched.
As for the depression? That's a different subject and would need addressed professionally also.
Here we can only be symathetic which is really of no help to you whatsoever.
So please seek medical advice today.
Do not wait.
Make sure you have photos of yourself before the tattoo and as you are now for any future legal action.
Get outside and some air, sitting in all day will only make both symptoms worse.
Even a burns mesh type bandage will help it heal and cover it up also.
As we all have to work regardless.
Remember that there's always someone way worse off than any of us.
Because of my own ill health?
My late mother used to ask me why I thought I was so important that people would bother to stare at me?
That put things in a whole new perspective.
So get yourself out!!
People are too busy to even glance your way.
Trust me, they have seen much, much worse.