Some people, like your father, aren't able to understand the hurdles people face if they can't see tangible evidence a problem exists or if someone isn't diagnosed with a widely understood condition. I'm sure that his lack of understanding is hurtful. I'm sorry for that

But I'm glad that your mother is supportive.
When your mind is racing or you start to have dark thoughts, Try reminding yourself it's just your anxiety and depression ****ing with you. It seems to make things easier for me sometimes.
What are you doing now to try to distract yourself from these kind of thoughts?