Hi again, I really think that you should be getting yourself a meter, and insist that your doctor prescribes you test strips, you need to test yourself to find out how the various food that you eat affects your glucose levels.
You appear to be eating lots of carbohydrates too, potatoes, brown rice and brown bread all raise your glucose and this in turn can cause your tiredness.
I know you are very new to all of this, but now that you joined the forum I urge you to make a real effort to read the posts, esp focus on threads that mention 'carbs', here is one thread to start you off
viewtopic.php?f=1&t=3527&p=18539#p18539 some very, very experienced members have posted to share their personal experience in controlling their diabetes; the more you learn about diabetes the better and the higher your chances of avoiding complications. 6.8 is too high, reducing your carbohydrate intake will lower glucose, but really you do need to test, that is very, very important, you need to do this after every meal.
Also do you do any sports/exercise, being active will also help to keep your bg within the healthy range.
And remember to ask questions if there is something that you dont understand or need more info on, there is always someone here that knows the answer to help you along.
Meters cost between £10 - £15 or so from chemists, if you are quick there is some nice person offering a free meter, you never know you could be the lucky recipient.
All the best
Karen