Not a similar experience, no. But I know from posters here, it's certainly not uncommon. I think for many people, it's like a bereavement, loss of the life you knew, or that's how it seems at first. It doesn't have to be that way. A diet change can make such an huge difference, and within a short time as you learn what is what, your confidence grows. Knowledge is power. Arm yourself by reading here, learning about a low carb diet, adding in a little exercise and drinking lots of water, and you will soon feel better, and with that more in control.
When I was diagnosed, I came on here and cried all evening, I was so afraid, and lost. Just a few short weeks later, I don't feel like that any more. I feel quite able to live a long and healthy life. It truly isn't all doom and gloom, and you will be amazed at just how much better you feel once you get into your new lifestyle. You don't have to take my word, few here will disagree.
Take care - Jo