Oh my word! You've really been through it haven't you.
Well, first things first: There is free Lantus available right now on the forum's 'For Sale or Free' Board:
http://www.felinediabetes.com/FDMB/forums/supply-closet-for-sale-or-free.15/ Please go there and contact some of the people who've posted there and work out something to get some Lantus to get started without having to try to get another script from a vet. There's someone there who's just lost their cat and are offering all of her supplies. Perhaps that'll help calm DH down a bit..
As for the rest of the testing efforts - yep, you need to get the kids involved and help them to understand that poor Giles is very sick and needs this medicine. And you can't give her the medicine unless everyone is very, very quiet so that you can get this little tiny test to see if she is well enough to get the medicine. Yes, I agree with Idjit's mom - you need to give them a task and test yourself to show them how it all works...it doesn't hurt Giles and it's going to help her feel much much better...
Last but not least - I had a heck of a time getting my Luci to sit still while I tested her. I used the kitchen island counter, placing a towel on top and all of her supplies close at hand - then my DH and I would try to hold her still while one of us did the poking - the first time I tried I poked her ear five times...no blood...finally got a drop and dropped it in the floor...got it on the strip from the floor...OMG I was a wreck...we all were...and then I read on this forum that they wanted me to do that MULTIPLE TIMES A DAY! I just about cried...I could not believe that I was going to have to go through THAT several times a day! I then realized what the alternative was...she was going to die if I couldn't help her...I became determined, very determined to help her - not matter how hard or how much it was going to take...I had to give this my best effort!
After a while..she started to get calmer...sometimes I'd put her on the towel, pet her an give her a treat...mess with her ears...no test...just let her go....then the next time, using my warmed rice sock, we'd try again...repeat, repeat, repeat...now this was over the course of weeks to months...I think it as about 2-3 months and then one day she just sat there...and let me test her all by myself...
soon we had a rhythm...she was laying on the test towel waiting for me!! I took pictures of that! I could NOT believe that she KNEW when it was test time and often would get up there on the towel...ready and waiting...now she purrs and sits and waits for me to poke her in the ear...she still gets food or a treat with every test...
So get Giles favorite treats, find a place thats comfortable and quiet - let the kids watch - I'd suggest not the laundry room where she's been locked up...soon you'll have this down pat and will be an expert at the testing thing...
You do not need to get a curve at your vet...I'm appalled that your vet - or any vet would insist on doing expensive curves on any cat and then raising the dose after ONE curve! Insulin takes time to build up....and that's a pretty big dose for a cat..unless Giles is huge! Try to get several tests but also - let Giles have a break now and then on the testing towel...so it isn't making the impression of 'oh, THIS is the torture place - and out come the claws'...try to change her thinking to 'Oh, this is the place where I get a treat'...well...she'll think to herself, I've got her right where I want her...
Find some baby sized socks and fill a bunch of them up with rice, so it's about the size of a golf ball, twist into a knot at the top to keep the rice in then...warm in microwave for 15 or 20 seconds, put it on the inside of your wrist - feel good? Use to support her ears...if too hot, then use less time next time...rub her head and back with the warm sock...just so she gets used to the feel and smell of it. This is all new and frightening to her and everyone involved...give the kids a sock to hold on to ... they're kinda fun just to have in your hand...so everyone will feel like they've got an important role in helping Giles feel better.
I hope this is helpful to you...I know it's a lot to take on...and you're getting stressed and everyone in the household is stressed...and no one, especially Giles understands what's going on or why...it takes time...try to breathe deeply and sing a little song - Giles senses your distress...and will become more upset in response to your mood...so try to relax...this will all come together...I promise