Problem in my immune system

When you have a hypo and pass out the alpha cells in your pancreas release glucagon and this tells your liver to release the stores of glucose that it is holding. This is how you came round from your hypo. It is a good idea to try not to take the alpha cell function for granted - the longer you have diabetes, the more vulnerable your alpha cells are. It you are hypo unaware (ie if you are having symptomless hypos) that will make the alpha cell response a bit more hit and miss, because the release of adrenaline in response to low blood sugar (which causes hypo symptoms) gears the body to use the alpha cells.

If you're used to running low and having hypos that might explain why you had a asymptomatic hypo. It might be a good idea to raise your target range in an attempt to avoid hypos.

You have autoimmune type 1 diabetes. Your immune system has proved itself ready and willing to kill off healthy cells in your body. If you have one autoimmune disease, you are more at risk of other autoimmune diseases. Hypothyroidism (which is what the TSH test is for) can be caused by an autoimmune disease. Hypothyroidism can cause hypoglycaemia because it would be linked with cortisol and adrenal insufficiency - so a lack of the usual hormones that raise blood sugar.