Newly Engaged and Already Stressed From Planning

So, I just got engaged Sunday and told myself and my new fiancé that I would give myself at least a week or two before I began wedding planning and research... I started researching that night and haven't stopped since. I'm already stressed out and overwhelmed. I have no idea where to even begin, what a good budget is, or how much vendors should cost. I just threw my initial budget out after researching for a bit. And I feel nuts that all I can think about is planning and it seems I can't shut up about it with my friends and family.

Sorry for the rant. If anyone has any advice or tips for the newly engaged, please let me know. I could use all the help I can get.