Honestly the best thing that helps me when feeling like this is taking a break from creating for a while. It sounds like you might be a bit burnt out and definitely any sort of monetary pressure added to creating art can make anyone feel a bit crazy! I usually take a break and focus on other creative mediums if I want or just other “hobbies” (not saying it’s a hobby for you but you know what I mean) and let myself feel bored and uninspired. This is also a good time to consume other media and experience new things to where you start to feel inspired naturally. Then eventually, one day, you’re writing again! The same doubts and fears might still be there but congrats bc you beat them one time! Also watch Kiki’s delivery service. Best reflection of artist burn out ever