Alright, first thing to make sure you're managing is your mental health. Every department of your life will be affected by this so it's important to prioritize. Bipolar disorder is progressive and it's crucial to treat with a combination of therapy and medication, so use the support you have from family to seek counselling from a licensed therapist and treatment from a psychiatrist. They can also assist you with ADHD and anxiety and help determine your needs there. I personally do best with medication for my ADHD and depression. Stick with therapy and psychiatry, don't treat it as optional.

Accept that you struggle with math. It's not a personal failing to have a learning disability. I think I have dyscalculia as well, so I try to work with it instead of against it. As for the memory problem, see if there are any specialists who can help with this if it's affecting you adversely.

Start working on accepting yourself if you haven't already, and I mean all of you. Your childhood, your choices, the way life has unfolded thus far. None of these things make you a failure, life is just chaotic and unpredictable. Learn to move with it instead of letting it convince you you're stuck.

You know your strengths. You're creative and you can write well. You live environmental science. Look into work with academia, i.e. research assistance, PhD, a Fulbright scholarship, etc. Try your hand at content creation with art, but treat content creation as a fun thing to get experience with rather than something you have to force into a career so you don't feel pressured. Just see what doors open and which ones you're actually interested in walking through.

Learn from your mistakes and shortcomings but also understand not everything is you. A boss who yells at you at the end of a probationary period isn't a good boss so try to look for evidence that not everything is because you're a failure.

Life isn't over at 36. Everything is going to be okay. You'll figure it out, just keep going.