Cortisone shots, a steroid, will raise your sugar dramatically. Once you are able to wean off the steroid, or it disappears from your system, your BS will come down.
Humalog is a rapid-acting insulin usually taken with meals. There are many insulins on the market. Your doctor is trying to bring down your BS, hence the raising of the insulin units. The thing with Humalog is that it is not a 24/7 insulin. It actually starts working about 10 minutes after injection and peaks around 4-6 hours.
I'm not a doctor or a health-care professional. I am only speaking from experience, as I take two insulins. My BS was way out of control with an A1C of 13.2. My doctor prescribed Lantus, a long-acting insulin (24 hours.) It is actually a basal insulin designed to keep your BS levels even throughout the day. Once you eat carbohydrates, BS levels rise. That is where the rapid-acting insulin comes in, to keep your BS levels from rising.
My doctor said the best place to inject insulin would be the belly area. I've been doing it for six years now. Insulin is given as a subcutaneous injection, meaning right under the skin. You really shouldn't be injecting into the muscle.
Not quite understanding why your doctor would presribe Humalog twice a day. It doesn't last that long in the body. That's why you are seeing ups and downs. Of course, the steroid does not help. Hopefully, that will resolve soon.
Keep in mind that Diabetes Type 1 is an auto-immune disease. Both types give you high blood sugar, but one does not turn into the other. Type 1 patients need insulin in order to survive for the rest of their lives. This disease has destroyed the insulin-producing cells within their pancreas.
I would ask the doctor if a different insulin might give you better results. As I stated, Humalog is a rapid-acting insulin, usually taken at every meal to prevent the BS from rising.
Bring your meter with you to the doctor. Show her your readings. Your symptoms are resulting from the high blood sugars you are experiencing.
There really is no such thing as too much insulin. The Lantus I take every morning is at 36 units. Then the Humalog is injected according to how many carbohydrates I eat. Sometimse it is just two units; sometimes 4 units; sometims 6 units. It keeps my BS from rising when I eat carbs.
There are some days where I will take 50 units or more of insulin. That is a total of the two.