Hi Will, welcome to the forum
🙂 Sorry to hear that you've had problems with the metformin, I think that's quite common so you're certainly not alone there! Has your doctor suggested trying the slow-release form, Glucophage SR? That seems to work better for a lot of people. As for Gliclizide, I've no personal experience of it, but I beleive it works by encouraging the pancreas to produce more insulin, so there can be a risk of low blood sugars - if you drive you need to be aware of this and test before and during a long drive.
If you'd like to read up on ways to help you manage your diabetes, try the following:
Maggie Davey's letter to newly diagnosed Type 2s:
http://www.diabetessupport.co.uk/boards/showthread.php?t=5836
and also Jennifer's good advice:
http://www.diabetessupport.co.uk/boards/showthread.php?t=5835
Plus, a book I always recommend, as do many others here:
Type 2 Diabetes: The First Year by Gretchen Becker (amazon link)
Anything you are unsure of, please ask away and we'll try our best to help! The good news is that you CAN get things under control, and may end up healthier because of the diet and lifestyle changes you are now encouraged to make
🙂