Hi @LoisLois,
What your describing is exactly why we call it the rollercoaster. One minute your like "yep, I got this" the next it's cloudy fog of doom and endless tears. It is a massive mortality check that you never saw coming.
@Afraser is right. We all assume we have oodles of time then bang, that's the end of your self security. Your body just betrayed you in a big way.
It does give you a little more feeling of control once the thing's out and you know exactly what you're dealing with Then you have a plan of attack. Somedays are still going to be awful and that up and down can go on for a while, but at least you will know where your next goal post is.
Try to stay busy and keep some normal things happening in your life. Flat out crazy busy and distracted helped me a lot. No time to think.
Night time is always worse and your brain will think of every possible aweful scenario it can.
What your are feeling is normal and real. Just ride the wave you're on at the moment, there is no right or wrong way to handle this thing. Most of us just muddle through as best we can day by day.
You will get busy with appointments and treatments, and, in what seems like an eternity at the beginning appears to be over relatively quickly and your out the other side.
All the best sweets. Keep talking to us. We understand absolutely how you are feeling.
xoxoxoxo