I suffer from the hellish trinity of depression, anxiety and PTSD. My advice is to come along, my first weekend at Empire was overwhelming and I ended up going to bed for 36 hours but It get easier and it gets better.
The majority of the folk you meet are amazing and letting a few people know you suffer on the downtime of Thu/Fri will mean you have some people in the field keeping an eye out for you.
One final thing to consider, you can take medication, you can speak to your counsellor or therapist but doing things that are fun create endorphins similar to exercise, the more fun you have the happier your brain will be in response and the easier your event will be, one kicker though, when you get home you will probably experience post LARP comedown, this can be very hard to deal with especially if you suffer with depression.
PM me if you need any advice or support, if we all look after each other we can have a lot of fun