Pretty normal reactions.....I cried myself to sleep for 6 weeks thinking why me every single day when first diagnosed type 1 25 years ago.
You have to take one step at a time, don't overload yourself with information or worries. Is there a diabetic meeting group in your town, they may be able to offer support in person, and I think it actually helps to meet someone in person who has the same impications to their lifes.
However, saying that....sometimes, as even with this forum, you need to speak to positive people.
Diabetes isn't the end of the world, honest. Some people may get complications, some people like myself haven't had any in 25 years.
I would advise though that you do express your feelings to the HCP's that are looking after you, so that they understand that you aren't feeling too good about living with diabetes yet.
I didn't magically come to terms with diabetes on the 6th week, but I did in my job at the time have an open evening for disabled persons and their carers, and that is when I realised that diabetes wasn't that bad, it was just me having to get used to it, and not allowing it o rule my life. I have control, and that I wasn't going to let diabetes control me. Apart from 1 recent incident which was my own stupid error diabetes and me have a pretty good bonding together. Yes, it is my best friend, and as with all best friend relationships we have our ups and downs, but really no more than any other person with other awful diseases such as schitzophrenia or epilepsy etc. It is manageable honest, and you are both having totally normal reactions. It will get better, I really do promise you that.
You need to get support from your family, friends and HCP's. You will get lots of support here, but not the close support that you will and can get from others close to you. Make sure they know exactly how you feel.