Some info on your experience level will help. Lots of divers do OW, then immediately go to AOW. That can be a lot to handle so soon depending on the specific curriculum for AOW. PADI AOW, or actual specialties such as Deep, Night, etc. IMO, regardless of curriculum, it’s just too soon right after OW. Take some time to do shallow, good vis dives, and work into slightly more challenging conditions.
Boat/Ocean dives can be challenging. If you are near any springs or quarries, that might make things a bit easier. Plenty of shallow spots in the Keys. What part of the Keys you heading to? I’m more familiar with the Lower Keys, but there are good shallow spots all throughout.
For now, it sounds like your problems are mental (assuming your reg is working properly). Work to get the confidence back wit easy dives. Might also not be a bad idea to have your reg checked out. A simple IP check could confirm that it’s in spec.
Havent decided yet - took off a week next month - open to suggestions of easy, nice dives in the keys