Hi Teddy Bear
You generally get the symptoms you describe when your blood glucose levels are over 10mmol/l (the 'normal' blood glucose levels is 4-7mmol/l). When your blood glucose is in double figures, the glucose spils over into your urine, making you need to pass more to get rid of it. This then makes you thirsty (lots of people thinks they are weeing more because they are drinking more - in fact it's the other way round).
You need to go back and see another doctor. You should certainly not have been advised to find information on the internet, and as you are so symptomatic you may need to start on medication to get your blood glucose levels down. Do you know if your urine was tested for something called ketones when you were diagnosed? How long have you had the symptoms and have you lost a lot of weight? These can be signs of Type 1 rather than Type 2 diabetes, and a simple urine test will help distinguish between the two. A large amount of ketones in your urine would require referral to the specialist diabetes service in your area. If there were no/just a trace of ketones, you are likely to have Type 2 diabetes (but should still receive far more advice and support from your GP practice than you have been given).
In the meantime, can you make any of the following changes to reduce your blood glucose? Make sure the drinks you are having for your thirst are sugar free, as sugary drinks will only make things worse (including fresh fruit juice). If you have large portions of starchy foods like potatoes, rice, pasta or bread it would be wise to reduce these down to about 1/4 of a 9" dinner plate - the starch is broken down to glucose in your gut and affects your blood glucose just as much as sugar does. You don't need to avoid these foods completely, just be careful with your portions.
I hope that helps!