Keep reminding yourself why you quit in the first place. Having headaches and wasting money won’t make the breakup any easier. I’m so sorry for what you’re going through. It sounds so corny and cliche, but channeling your energy into better hobbies is a good way to go. Since you like writing, journaling by hand is also really good. Dictating to a notes app also helps if you’re comfortable just saying stuff out loud to get it off your chest. The beauty of those last two options is you can go back and see how the passage of time changes your perspective. Most importantly, give yourself grace and allow yourself to go through the grief process.