Do you have a timed feeder? If not, you might want to run out today and get one. When I went back to work when punkin was diabetic, i thought mine was worth its weight in gold. I used the
Petsafe 5 Compartment feeder. You can buy it at Petco, probably PetSmart too, or online, although that won't get it to you in time to use it tomorrow.
The complaints online are always about it not opening all the way. I found that was because the food tray, which lifts out, has to be fully seated in the base unit. If it's all the way in, and you can press a button to rotate the food tray forward one turn, mine always opened correctly. You can set the times you want it to open. If I thought punkin was headed into low numbers, I set it to open every 1/2 hr for the 4 times you can have it open.
If you can't get a timed feeder, you can freeze food for Spaz in a combination of muffin pans and ice cubes (mix with some water first), and leave him food that will thaw. Some people do a combination of some high carb and some low carb catfoodsicles.
Take a look at the first sticky on this support group page about working full-time and following Tight Reg. It has lots of people's suggestions on what worked for them.
You also have the option of giving just a token dose - like 0.5u in Spaz's case - or skipping the shot entirely if you think you need to do that.
Edited to add
"Where Can I Find?" link - take a look in the second section of the post for a discussion on timed feeders.