Welcome to the forum
@PAG
Sorry to hear about your diagnosis
Feeling overwhelmed is perfectly natural. Some people liken diagnosis with a long term condition to a form of grieving, with all the intensity and jumble of emotional states that can bring - anger, denial, bargaining, depression and acceptance.
When it comes to managing your diabetes, it’s best to make changes to your menu and activity levels gradually - partly because they need to be sustainable long term, but also because very rapid and sudden changes to blood glucose levels are harder on the fine blood vessels, and changing things more gently will give your body time to adapt.
Diabetes is a serious condition, but it’s also one that can usually be managed well with a few changes and adaptations - it’s something that you can learn to live well with, and it shouldn’t stop you doing things you enjoy. Try not to be disheartened about your diagnosis, many people on the forum later reflect that their diagnosis became a catalyst which prompted them to make positive changes towards a healthier and more active life. Perhaps changes that they had been intending to make for years.
Let us know how you get on, and perhaps consider signing up to the Learning Zone (orange tab in the main menu) which is packed full of informative modules to give you a solid starting point.