Anniversary of a traumatic event in 5 days!

I’m seriously scared,

Does anyone have any tips on how to survive a traumatic anniversary?

Any suggestions will be helpful.

I usually end up harming or doing something dangerous just to try and cope with the memories/flash backs!

But I need to get a grip on this, there are so many things that trigger the memories of it or flash backs.

I’m constantly having nightmares.

I had a panic attack last night due to it all becoming too overwhelming!

Help please?