Oh, wow. I've had burnout and low periods that lasted for MONTHS, so I'm a little envious that two weeks was your max. But I know when you're used to a steady groove, even the smallest hiccup can feel really intense. I think over the years I've learned to look at the urge to procrastinate and examine what's making me do it.
A lot of the time, that sort of unsatisfied frustration means you're growing and developing as an artist--like having a little fallow period where your fresh seeds are growing and bringing you new crops--and honestly, that dormant period can be super important for your artistic muscles to rest and recharge. So first, I'd say don't fear the downtime! When I hit a wall, I usually disengage from whatever is giving me trouble, whether it's a certain piece or drawing altogether, and do something else to stimulate my brain like cooking or crafting or even just rearranging a room. Your brain keeps working on problems even when you're not directly plugged into whatever it is, so sometimes giving yourself that space you might unconsciously work out what's bothering you.
But also there's totally the kind of procrastination that feels a lot like laziness, and while that might also be frustration, it can also definitely be a discipline problem. For that, I try to get myself into a routine that keeps me engaged and spaces out breaks. Time intervals for working, disabling internet for 30 minutes at a time, rewarding yourself with set amounts of downtime away from work, or even just scaling back distractions in general will work wonders. I also have a lot of lists, because checking things off scratches my particular brain itches. Accountability with creative peers is great--even if it's just posting to your social feed of choice that you're going to do A Thing.
Also be sure to check in with the stakes of whatever you're not wanting to work on--if it's purely a personal thing that doesn't have a hard deadline, then I'm more inclined to think personal forgiveness and disengagement is the way to go. But if it's a paid project that you have to have done by a certain day in order to pay your bills....routine will get the job done. Burnout on something that you're getting paid for is the worst, but having a system for attacking that is a lifesaver.