Welcome, i'm glad that you are now on the right treatment for you. Given time I'm sure that you will be able to gain better control. At the moment it is clear that you are on fixed doses of insulin.
Unless you eat the same amount of carbs at each meal then it will be difficult to control your glucose levels with any degree of accuracy. It is early days yet but learning to count your carbohydrates and adjust your dose according to what you are going to eat in that meal can be much more effective.
There are 2 books that can help with this
Using Insulin John Walsh
Think Like a pancreas Gary Scheiner.
Later you might find it valuable to do a course
There is a very good course available in some areas of the UK called DAFNE (dose adjustment for normal eating)
and an online version
http://www.bdec-e-learning.com/
Hindsight is a wonderful thing, why I wonder did your doctor say that?
The fact your diabetes was able to be managed to a degree with oral medications for seven years and you don't mention DKA or ketosis at diagnosis suggests that you may have LADA (latent autoimmune diabetes in adulthood) which is a subset of t1. LADA, though named in the nineties had very little written about it until recently. Even today when it's clear that 10% or more of T2s are probably misdiagnosed, many doctors, expecially GPS aren't aware of it.
One third of people diagnosed with T1 in Australia were initially diagnosed as T2, and this included those who were relatively young and had an unmistakable rapid onset.There is also a multi page thread going on, on one of the American Diabetes forums with many, many stories of people initially diagnosed as T2 who eventually were found to have LADA..
There are tests that can
aid diagnosis. A C peptide test is likely to show elevated levels in a fairly recent T2 and low normal ones in the early stages of LADA. There may be antibodies (particularly antiGAD, but sometimes others) present. A large number will indicate an early necessity for insulin, but people caught early may have only small numbers...as may some T2s and people without diabetes at all.
There are some authorities who are suggesting that these tests are used on all people who don't fit into a T2 profile and certainly if they find that oral drugs are not working and the person has continued high glucose levels and is losing weight.
At present anti GAD testing is not routinely available in the UK. though as you were type 'unknown' and seemingly under a specialist rather than a GP it does seem odd that you were not tested sooner.
if you never had ketosis there was always the possibility of a genetic type of diabetes called MODY, people with this would not have antibodies (and are not T1 or T2) You are even less likely to be tested for this as it involves expensive genetic testing and the tests are only available at a research centre in the UK .
I'm not a lawyer and that's where you need to go for legal advice but given that diabetes "pigeon holes" are not clear cut; the researchers argue between themselves on precise definitons and are still researching the best means of diagnosis and early treatment (there is ongoing research in the uK into how to define and diagnose LADA but this started well after your initial diagnosis) . I doubt you'll get far. Even in the US, I've heard of lots of stories of misdiagnosis, but I have never heard of anyone even attempting to sue.