I have had this issue and after 6 yrs of being on a pump I made the difficult decision to revert back to MDI.
Like you I have had issues with the cannulas.....from making my skin sore to leaking and tube blockages it’s been hard to say the least. I had a baby last year which left me which lots of stretch marks on my tummy and it’s since then that I’ve been having problems. My consultant believes that this could be what is causing the issues.
I am interested in what insulin types you have used. I currently use Novo Rapid and some days I feel like it hasn’t worked at all even when I’ve bolised enough and corrected. I feel a change of insulin might help me.
I have a really odd regime..
Insulatard. At 3.30am that kicks in gradually for my rising levels 3.30 am onward. Kicks in nicely from about 8am to cope with waking phenomen
Insulatard again at 7 or 8am before fetting up PLUS a bolus of novorapid to keep levels from sky rocketing on getting up and balances out my afterrnoon and evenings.. tails off nicely when I need it to tail off.
A very small 1-2 unit ( still working on tweaking this) tresiba dose between 4-6pm that is reslly just enough to be in me overnight... But Tresiba cant cope with my rises at 3.30am till midday.
Sometimes depending upon health may slso need a bolus at 3.30am too.
All of those without eating and acting to keep background levels right.
All food boluses are novorapud but generally only eat once a day between 4-6pm anyway...
Alot of help from my cgm to establish this routine...hospital not got anybody else like me on this regime and coukd only offer suggestions for "average" diabetics, which I'm not. Consultant last week said for me to just keep playing around as their regimes not work and he could offer no alternatives to me other than me pkaying around as I do....