@Eva,
(((( sistah! ))))
Yes, you will get used to it - sorta. Yes, there are more firsts coming that will give you pause. Yes, you will start sleeping less and worrying more. It's ok, though. It's supposed to be that way. Noddy used to tell me that gray hairs are earned. You're earning yours now. He'll be fine. So will you - eventually.
A very wise (an equally anxious) friend once told me that she drove herself mad with worry when her girls were teens. K was approaching college age at the time and I asked her how she survived the college years. She said, "Oh, that's when I stopped worrying!" The fact that she
knew they weren't coming home at night forced her to set aside her worries. Otherwise, she said, she was going to truly go crazy with worry.
The Unitarians have a saying,
"Roots hold me close, wings set me free."
You'll always be his roots. You've given him a good footing and foundation. You've also nurtured the development of his wings. He's using them a bit more and more these days. It's not easy being a mother. You do indeed earn your gray hairs. But, as you watch him spread his wings a bit more each day, take comfort in the knowledge that you've done good, mom.
He'll be fine. So will you.
((((( Eva )))))