Guest post by "Z" I agree- don't feel bad. IIRC, you've got depression- and that is a nasty little monster when you start feeling bad about things.
You produce an amazing comic, you've got great characters, and you're doing it for free. I know you've got the patreon up now, but you aren't exactly making megabucks and the people who are contributing to it are doing it because you're a great creator, a good person, and they want to see you succeed. Focusing on school will help you succeed. Don't feel bad for taking care of yourself!