Caitlin - I think the biggest thing is just to keep working on relaxing, and trying, and know that it's going to get easier. You've done lots of tests, and this is just a little blip. It will start working again, and it will get easier and easier. This sounds funny, but I honestly think their ears "learn" to bleed. During his OTJ time when I would try to get a test, it was a lot of work to get blood because we weren't doing it very often. Now that he's getting a bunch of test each day, I barely have to poke him at all to get a nice little bead of blood. I think this is one more place where every cat is different, so just figuring out what works for you and Pita. For what it's worth, this is what helps with Sam:
Sam is a little on the feral side, so burritos aren't even an option. He would claw my eyes out before he'd let me confine him. So I had to woo him into cooperating with the process. I made a little felt heart and stuffed it with rice (like the rice sock, but cute

), heat it in the microwave, and then scratch his head and his chin and hold it on whichever ear he gives me. I try to keep it on his ear for closer to 30 seconds, but since he only lets me do it for a few seconds at a time, that whole process takes a couple of minutes. It helps us both be calm by the time I try to do the test because we've had a couple of minutes of scratches and headbutts and kisses.
I don't even get out the treats until the test is done, because if he smells a treat he goes crazy and will bite me instead of letting me test him.
When we were here last time, I used a 26 gauge lancet most of the time - and that was during the summer when it was warmer and easier to bleed anyway. Right now with winter chill, a larger lancet will be your friend.
I put a folded cotton square behind his ear so I could poke without poking myself if I went all the way through - which I did often for awhile.
Then squeezing/massaging his ear to get the blood to bead up.
Also, I would usually start testing probably 30 minutes before I wanted to shoot so that I'd have time to fail, let him go for a few minutes, then bring him back to the testing spot and try again.
I know you're already doing a lot of that, so I don't know if anything in there will be helpful. You've done lots of tests, and it will start working again. Just hang in there, don't stress about missing a few tests, and know that we all love you!