Hi,
Yes, it does take the body a while to get used to lower levels, and you may experience discomfort. However, you need to ride it out and it will pass. It doesn't take long.
It is asking for trouble when your levels are higher than the guidelines. These need to be brought down, and a correct and suitable diet is the key to this. Your meter should be helping you, along with a detailed food diary (including portion sizes)
If you test before you eat and again 2 hours after first bite you will see at a glance what that meal has done to your levels. If the levels go up by more than 2mmol/l there are too many carbs in the meal, which need reducing in portion size or eliminating. It is preferable to keep any rise well below the 2mmol/l mark. You can record your before and after levels alongside the food, and look for patterns. The worst foods for raising levels are bread, rice, pasta, potatoes and breakfast cereals (including wholemeal varieties and also most fruits).