Hi Kit
I doubt whether you are out of the honeymoon period just yet, some of your problems could be because you are still in it, and the pancreas decided to add a tad of it's own insulin to the mix..
As to your pasta tea, the problem here, is that pasta is a slow burning carb, which can cause a couple of problems with how it effects blood glucose, and the interaction with insulin..
Because it's slow what can happen you inject the insulin to cover your meal, the insulin starts to do it's job, but the pasta hasn't started to adsorb until later and there isnt enough for the insulin to work on, you end up hypo but later 3-4 hours later you end up high.. This can happen when eating any foods that have an high fat content, such as pastry, pizza etc.. The term for this you will quite often see, is 'The Pizza Effect'
Sometimes to be able to eat these types of foods, spilting the quick acting insulin, so some before you eat, and the rest after over-comes this, but it does take a bit of trail and error to find the right split and timing of the injections, and of cause ends up with more injections needed in an day..
Another possiablity, is the difference between the meals could hae been, you had a difference exercise/physical acttivity earlier in the day, which could have made your insulin more effective..
Difficult to say which, and my best advise is to take notes, of physical acttivities you are doing durning the day, along side your carb counts, types of foods that you've eaten and of cause your blood glucose levels, hopefully with this indepth information you will be able to indentify, whats what and be able to adjust your insulin needs as required for god control