Sympathy Maryanne!
Been there, done that, wanted to bin the b thing after 3 to 4 weeks cos NOTHING worked like it did on MDI, only thing that stopped me was the voice in my head, my husband's voice (though that was very unfair of me as he's always supported me!) saying I told you so.
That was NOT going to happen.
Pumper Sue offered me help and lots of other people, including my lovely DSN - but I explained that No - I have to do this myself. But thanks ever so much for offering.
And suddenly after giving myself a right talking to - it all started to come right again! Well, it took about a week or 10 days before it started making more sense and that's because I was actually analysing what my meter was telling me - and working out sensibly how to respond to that with basal tweaks and timings etc - and that's what you have to do. Use your analytical brain more, instead of just your intuitive one.
I have to think like that now when considering people's probs who are on MDI - that's really weird!
You'll get there and it WILL be better! Honest.