I second bsc’s suggestion. Your situation pretty much describes mine exactly.
I had to do three things to smooth things out. First, I eat within an hour after each workout. Second, I gave myself one or two rest and recovery days between intense cardio days. Unless you’re training for some particular event that requires consecutive days of intense cardio, I don’t know that, as a diabetic, you are getting much more of a benefit by going consecutive days if your BG numbers are suffering. I still may do consecutive weight days, but they don’t affect my BGs as much, personally. Combining my cardio and weight program, I’m still only in the gym 5 to 6 days a week max. I think you may find that giving yourself a rest day helps steady your numbers and helps your overall program.
Third, and probably the biggest change, I went fro MDI to a pump. All the chanages helped, but the pump helped especially with overnight lows. Being able to dial in a specific basal dose, and having multiple basal doses programmed, makes a huge difference.