I second not doing lessons, doing reviews only will unlock more lessons, you don’t have to do them right away, especially of you’re trying to get everything under control. I am also student, and I’ve only recently began doing small amounts of reviews again after an extensive build up and a lot of homework and exams.
I have a script [Userscript] WaniKani Prioritize Overdue Reviews (reorder script), which is similar to the reorder script, but it doesn’t interfere with the SRS as much. I’m not sure what settings are possible, because it works for me how it is, but I’d say it’s well worth checking out along with the rest of the API and Third Party apps section The New And Improved List Of API and Third Party Apps.
Just don’t skip vocab items or anything like that, it does more harm than good; take your time, wanikani isn’t a race, the reviews do increase and some people go incredibly fast, but most of us plod along. Part of getting overwhelmed is a bit of a mindset, which is normal, that’s how wanikani works to an extent, but don’t feel pressured to get to 0/0, each person goes at their own pace, and if doing Wanikani is at anytime interfering with your mental health, there is nothing wrong with switching on vacation mode (at the bottom of this page), and taking a break.
Good luck!