If you have just been diagnosed with IIH then the main thing is don't worry too much. It's a horrible condition and as a fellow IIH-er, I completely understand how you are feeling but there are ways to live a good life and to be happy even with IIH.
I was diagnosed 6 months ago so it's still kind of new.
You are not alone, there are so many people that you don't know who are experiencing the exact same thing. It's okay to rant and be angry, it's okay to cry. It's okay to have good days and bad days. It's okay to have a day in bed. It's okay to cancel dinner that day. It's okay to have a full nights sleep and still have to have a nap late afternoon. People cannot expect you to be happy 24/7 with this condition as it takes the life out of you.
But please be happy, please make the most out of your life. Please continue to be kind. You are a wonderful person and you are going to fight this and come out on top.
Support groups and chats like these really do help. To read a post where someone is feeling the exact same thing can sometimes be a weight lifted.
You are an amazing person who's been dealt a horrible set of cards but only because you are strong enough to handle this. Please reach out to people because it helps so much.