This is simply not accurate. You have been through trauma that would shake many souls. There is no should about getting over it. .It is what it is. You deserve support on your road to recovery. It's hard.
Sometimes in recovery, digging up the trauma will lead to symptom spikes. Feeling worse after journaling about trauma would be really common. Doesn't mean it's hopeless at all. Repeating depressive thoughts over and over would lead to those without depression to start feeling down. There are some different ways to journal to begin to challenge and change those depressive thoughts.
Right now, I think you might need some new tools on board to manage the symptoms and get things calmed down. I strongly encourage you to use the search bar on this site and read around for threads or on the search engine of your choice for information on
grounding skills. It can help stop or reduce the panic attacks. Lot's of free info online too. This site might also be helpful:
dbtselfhelp,com. There are a lot of great tools there for managing depression, self injury urges, etc. At first, building up your toolbox won't feel like it's enough to help, but it will very likely help over time and it's something you can do without access to a counselor and is what a good counselor would walk you through doing anyhow. It will be like building a muscle.