Hi Ophelia
Some great advice here. It really is about taking control of things, it may seem insurmountable at first but small steps lead to great changes eventually, you will get there. The roller coaster ride of your Blood Glucose going high then low will have such a negative effect on your moods alone, the way this effects other Hormones and Nuro transmitters all effect our mood swings and mental well being.
When you get more stable BG you will feel a lot better emotionally on the whole, which in turn will spur you on Physically to carry on with positive changes....Great idea from Sam to keep things the same food wise, meal in meal out, day in day out for a number of weeks and test a lot to get things stable, write results down and you will begin to see patterns from adjustments. Then to introduce exercise when you are more stable, don't rush to do too many changes at once.
Just wanted to offer you a hug and say I hope things get better for you.