Insulin Resistance

Hi All, I'm new to the forum
I have had diabetes type 2 since July 2005, I was caught early with an A1C of 8.2.
I took Metformin at first but couldn't tolerate it so doc switched me to Gliclazide.
To cut a very long story short since early 2006 I have been controlling my diabetes with exercise and diet alone. I did lose an initial 6 stone and exercised for 2 hours daily.
2 yrs ago I was diagnosed with a substernal goitre ( the goitre is growing down into my chest), since then I have had many thyroid hormone tests and they have all come back normal so according to the thyroid doc I don't have an over or under active thyroid ( I have other probs related to the goitre)
Anyway I have been putting on unexplained weight which I originally thought was my thyroid, my doc sent me to an endocrinologist and she has suggested that I may be insulin resisitant and that's why the weight has been piling on. I have put on 1.5 stone in the last 6 months despite all the exercise I do and a very strict diet. My question is .. I thought I had diabetes very well controlled and could insulin resistance be the cause of weight gain and could it show itself after many yrs of tight control, my doc has started me on 500 of metformin ... thankyou

Just like to add that my cholesterol is 7.1 and that I have high tryglicerides, also have high blood pressure reasonably controlled with meds. Also when I was first diagnosed I had proteinuria, at first I was under the kidney specialist but my protien has calmed down, still have protein in my water but the nurse monitors it now. I also use very good fats eg coconut oil and olive oil and follow a low carb diet ... as I said in my earlier post I just don't understand how I can be insulin resistant this far down the line with well controlled numbers

Hi Mark I got my BMI to 22 .. when I went to the specialist re proteinuria, they did all the tests and a 24 hr urine clearance twice and they could find no reason as to why my protein was so high, I had normal kidney function, they saw me a few times at the hospital then signed me off as my protein was dropping to more better levels, so an explanation was never given.
I stopped gliclazide to see if diet and exercise would work and it has been so far, my last a1c was 5.4 the one before was 4.9 ... so good numbers.. as for the high bp and cholesterol all my docs have said is that it's down to my diabetes ... and I have tried stopping bp meds and my bp just goes sky high ...
I'm thinking maybe it's my thyroid goitre messing all of my endocrine system up ... as you said it's complex and it's ever so frustrating knowing that all I'm doing eg diet and exercise and the weight never stops going on, I am hoping an answer is found soon .. got an army of specialists onboard so hopefully things will start getting better