Rather than worry, go see an MD and tell them of your concern.
Ask for a GTT (glucose tolerance test) It needs to be done properly, your BG needs to be tested every 15 to 20 minutes for 3 hours. That will tel you a lot about your bodies response to carbohydrates, Like your phase 1 and phase 2 insulin response.
Better to know than to worry.
The other test to do is called Hba1c, which measures your average blood sugar over the last 3 months. This is a blood test done by your Dr.
If you are prone to diabetes (family history), it may be worth adopting lifestyle measures that can help prevent / or delay onset. These include regular exercise, normalizing weight, and eating a lower carb diet.
Given the family hsitroy you should be monitored at least annually to track how things are going.
A blood sugar level of 148 an hour after eating is a little on the high side, but not alarmingly so. You may wish to eat lower carb foods. Your blood sugar level of 111 after 5 hours of not eating, is not high, however, after 5 hours of not eating your blood sugar levels should have gone back down to fasting levels (these are ideally in the 70 - 95 range).
Of course, there is the chance that the meter is old and not working properly.... However, best y ou get this looked into and adopt appropriate lifestyle measures, as mentioned.
Atkins diet is a low carb diet. If it worked for you weight and health wise you probably should go back on it.
On a low carb diet, you can still eat plenty of non-starchy vegetables, which are also good for health.