aah... makes sense. You are newly diagnosed?
In future, when you feel tired or if your legs feel heavy.... always test. As a rule of thumb, I always test if I feel tired, or if I feel a headache, nausea....etc. You will soon get to know certain 'feelings' which will tell you what your sugar levels are doing. I find that my mouth and lips get a bit dry when my blood sugar starts getting too high (for me, thats when I am usually around 12). When I feel my breathing changing, or my mouth gets a bit tingly, I know my blood sugars are dropping - usually between 3 and 4.
From a T1 since 2001 to a new diabetic..... the best advice I can offer you is: Always carry your meter & Insulin with you. Always carry glucotabs or a tiny bottle of Glucojuice incase of emergency. Try not let your blood sugar go over 10-12. (To avoid long term complications)
Never ignore highs or lows. Keep a diary if you can because that is the only way you will know what your sugars are doing and how to get a stable control. Without a diary, it is impossible to see a pattern of what your blood sugars are doing. Try stick to drinks that contain 6grams of carb per 100ml or less, opt for a low carb diet and do plenty of excercise - that way your body becomes sensitive to insulin and if ever you have those horrible hypos, your body will absorb glucose faster so your hypos will not be as intense and scary.
Lastly.... when treating a hypo, try not over treat it sending your blood sugars sky high again. When I was newly diagnosed, if I had a hypo, Id eat and eat till the feeling stopped. That created further issues for me and eventually i was like a yoyo.
Doing the DAFNE course was the best thing ever. I learnt to only drink 100ml of lucozade and eat about 15grams of carbohydrate when having a hypo and then to wait for the feeling to pass.
When I was diagnosed, nobody ever told me about all these things. They only told me the basics. Its only when I went on the DAFNE course in 2008, that i learnt how to take control.