Welcome and you're not alone.
I am on day 5 and still go through mood swings, tears, panic, restlessness etc. All I can tell you is that day 2 will be better, and day 3 will be better than day 2 and so on.
Glad to hear you are going to a meeting tomorrow, can you do one today? If not stay on SR for a while, it's safe here. Another option is to go to your Dr. or a walk in clinic and make sure your in good health.
Thanks for posting and glad to hear your sober today.