Two of my first cousins have type 1 Diabetes, one was diagnosed at 18 months. My aunt has learned A LOT from taking care of them for the last 10 years. I would be happy to ask her a specific question on your behalf, if you let me know privately.
I remember her getting up to check the kids sugars in the night often. The doctors office should have provided you with a prescription or samples of urine testing strips and you should also have a glucometer. Now both kids have pumps and it has been very helpful. PLEASE check with the endocrinologist about this issue. Thirst in a diabetic is a serious symptom.
Many hospitals or doctors offices can connect you with a diabetes educator for free. perhaps you could also find a parent's group or another mom in your doctor's practice who can walk alongside you? There is a lot to learn, and you don't have to walk alone. I second the person who suggested getting some help. Even one afternoon nap and an hour trip out by yourself would do wonders for your well-being.
Just to encourage you, both of my cousins are now doing fantastic. They are healthy, active kids. One is sixteen, playing six-man football, active in Boy Scouts, busy with school and learning to drive. The other is a talkative, bright and funny 10-year old girl who loves to ride her bike and garden. You will get through this, and your son will be just fine.