Today I'm writing this in hopes for some help in what to do. As some of you may remember, I've been having issues with retainers breaking after only 5 months of being out of braces. This issue is not getting fixed.

I had two cracks in my top retainer in Novemeber (one near my back molars, one on my incisor tooth). I went in to have a new retainer made, and they made me molds for a bite splint. Previously I had issues with both retainers breaking. All of the breakages happened while taking my retainers OUT. (Minus one where there was teeth shifting).
They didn't replace my top retainer despite the fact the incisor tooth area was cracked and my teeth weren't being held right. Instead they trimmed the back cut piece off because they "aren't worried about the back teeth." Finally last week I got my bite splint and was told by the new girl that works there that I was supposed to wear the bottom retainer WITH my bite splint. I specifically asked her this question because I was curious.
I woke up this morning to cracks in my lower retainer. Which is what I've been trying to avoid since getting retainers. The whole point of the bite splint was to NOT have to get new retainers. Well, I called over and was informed the girl was WRONG and I am supposed to wear my bottom retainers 3 hours before putting in my bite splint and to take my bottom retainers out after inserting my bite splint.
My teeth shift after 12 hours without retainers.
I've been down to 12 hour wear since month 2/3 without braces (which to me is ridiculous). Unfortunately with how busy my schedule has been and my difficulty with getting these retainers out, I've stuck to their 12 hour only timeframe instead of wearing them longer like I think I should be doing still. I only have 15 minutes for a lunch break at work and five (+) of those minutes would be taken up by just taking those stupid things out and putting them back in. When I was in 24/7 wear I wasn't even taking them out, thus couldn't eat at work, causing me to lose weight (which for me is bad).
I don't know what to do.
The girl thinks I should stick with this stupid bite splint and wear it overnight and just wear my bottom retainers for a few hours.
But I know they'll shift. I feel more comfortable wearing top and bottom retainers. The bite splint is so large in my tiny mouth and it's not comfortable. I can't close my mouth at all properly. And it just reminds me of my time with my awful bonded palatal expander. I don't wear it when I stay at my boyfriends place because it's embarrassing to me. My jaw joints are also sore throughout the day. I just don't think it works.
I don't know if maybe I should get new top and bottom retainers so I can wear those every once in a while and just do the bite splint thing occasionally when I'm home. I'm going to buy the Invisalign removal tool so I can get my retainers out easier.
I'm just lost as to what to do. And I'm frustrated I've had so many problems. The ortho office thinks buying new retainers is a waste because I'll break the retainers again. I've had so many issues where they just won't listen to me. I don't know if it's time to just move on. Or what.
Any advice is appreciated.
Thanks for listening/reading through my ranting.