Fair enough. I know the feeling.
…

… however…
If you’ll allow me…, let me give you a very simple, easy, virtually no-risk challenge you could try, if you wanted to:
The first two levels, 1 and 2, have that ‘accelerated’ SRS timing, so that the Apprentice items go twice as fast: 2 hours, 4 hours, 8 hours, and 1 day, to get all the way up to Guru. So, in the worst case scenario, this little experiment would only really risk a couple of days with a few (not many!) extra reviews.
So, the idea is simple. Just pick a few of your already-burned Level 1 or Level 2 items – say 5 or 10. You could pick them randomly (using the Levels menu on the homepage it’s easy to do) or you could pick ones you’re already familiar with (if you want to minimize challenge), or you could pick ones that are a bit less familiar than others (you’ve already burned them, but maybe they’re a bit fuzzy, or maybe you can’t quite recall off the top of your head, but when you look at the WK page they come back to you easy enough).
Then just resurrect some of these. Try five, maybe. Or even three, or two, or even just one. Come on, eh? Just one? You’d barely notice it! Just for an experiment.
And besides, you will easily re-burn it anyway, shuffled in with all the other items you’ll eventually burn. And it’ll be the easiest item to burn, since you’ve already burned it.
A grand total of 8 reviews of an item you’ve already burned once. It would take, what, like maximum 1 minute per review, and that’s a super-conservative estimate. In fact, in the grand scheme of things, you could probably do all 8 reviews in less than 60 seconds total! But let’s say 1 minute per. That’s still less than 10 minutes of your entire life just to try this little experiment.
The purpose of the experiment is to see for yourself: Does ‘re-visiting old friends’ like this (only occasionally, mind you) really create stress? Or…, perhaps, … might it actually be a little bit de-stressing, as I’ve personally found it? Or, maybe it’s just neutral, no stress, no de-stress, just no plus or minus either way? Ya never know till ya try! 
And hey, if it turns out to be a bit de-stressing – or heck, maybe even a bit fun and enjoyable as I find it – then you’ve found a new way to bring back some of the enjoyment of WK/learning-Japanese once again. Could be a handy tool to help ward off frustration and burnout. Just a thought. Worth a shot, IMHO, even if it’s just to experiment with a single item, or maybe a handful of them. Got virtually nothing to lose (but maybe maximum 10 minutes), potentially useful technique to gain… 