Having a raging thirst can be an early indicator of diabetes. I would suggest drinking just a normal amount. Don't go over the score. If you have been given an appointment in a few weeks then that would say to me it's not urgent.
When my hubby developed diabetes he was diagnosed and in hospital within hours as he was very very ill.
Don't worry, you will be given a few tests, a new diet to follow and some pills to take.
Don't think you will end up using insulin, so try not to panic.
Honeyb
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