Hi juli, I was misdiagnosed with Gestational at the age of 27, then Type 2 Diabetes because of my age. Oral meds did nothing for me as I got sicker. Finally made my way to an endo who diagnosed Type 1. My endo says that I was probably misdiagnosed because I was probably still honeymooning at that time.
Good for you for going low carb and exercising - that's the best thing you can do for yourself. The exercising and avoiding lows is tricky but there are many here who can help you with that better than I. I do know that Lantus and exercising can be a troublesome combination as some here have seen post exercise lows with fast drops.
I am on Lantus and Humalog. My Lantus needs have been all over the place for the last year. A year ago I was on 49 units; today I am on 15 units. I've lost some weight which is part of it, but hormones are accounting for the rest apparently.
I feel your frustration with your bg being all over the place. The problem is that you can drive yourself crazy trying to figure out why because there are so many factors that influence. I too am one of those who wants to understand so that I can "fix it". Unfortunately, sometimes we never know exactly why - we just have to accept and adjust.
Going to a pump should help you with exercising and also with tiny doses of insulin so hopefully that will help you stabilize. I am moving from MDI (after 25 years of shots) to a pump on Tuesday for the same reasons.
Hang in there and good luck to you! You will find lots of help and support here. :)