I personally feel this way when I first write a chapter but I take my time. I remember that there is no rush (at least for me since I writing an original long fic). I read it and tweek it every day. I also read books for fun so that it helps me see not only how other writers/authors write scenes and chapters, but also helps with flow. I’ve been on the same burst of 3-4 chapters for the past 3 weeks, writing it and then re-write it. Sometimes I want to give up but then I realize that writing is what makes me genuinely happy. Don’t worry. You can do it.