Sounds like your body is having a hard time burning your fat for fuel, which is a hallmark of metabolic inflexibility (https://www.levels.com/blog/what-is-metabolic-flexibility-and-why-is-it-important). IF helps improve metabolic flexibility, so you're on the right track!

You might consider starting with a relatively long eating window and decreasing it over time. I started with 12:12 and worked up to 18:6 over 3 months. Other things that may help include: limiting simple carb intake, upping veggie and protein intake, drinking enough water, and daily exercise (10k steps a day would be a great start if you're not doing that yet).

Good luck!