I have been having a strong sweet vaginal odour, no discharge or discomfort. I have also been having some stress and have been having more than recommended amount of alcohol (3-4 drinks per night) I know I should go to the gynaecologist but they don't have hours when I am not working. What is the best case scenario and the worst?
Diet and/or hormone changes or vaginal infections could all affect vaginal scent. It's good that it's not a foul odour and that you have no discharge or discomfort, which could indicate infection. If it's due to the drinking or perhaps going into pre-menopause, is hard to say without an exam and/or blood work up.
So, best case is, it may be natural body if there are changes going on.
Worst case, possible infection, pH balance may be off as well. I don't know if you douche on a regular basis etc. Try eating some yoghurt, as this helps to bring pH balance back to normal. If there is a change with your urine or a sweet smell in the urine as well, this can indicate sugar. I know you said your work hours vary. Perhaps you can even get checked at an after hours clinic which is generally open till around 8pm or later. So that is an option as well.
What kind of diet causes this... Need more information.
Without any tests, there is no way to pin point the exact case of what may or may not be going on. You asked /worst case scenario, which you were given.
Things we eat can cause a change in the pH balance. Citrus, fruits, juice, can cause a sweeter smell. While things such as coffee, beer, dairy can give an odd scent. Everyone is different, so what may be , won't be other etc. If a persons body is dehydrated v/s hydrated this can effect the smell. Hormonal imbalance can effect smell as well.
Diabetes or uncontrolled sugars can affect this as well. Unless things have changed recently in your diet etc. Especially if this is something new . Do keep in mind, some woman have a natural sweet smell, while others may have a musky smell. It's just how the pH balance is set up.