Lost all fitness data after ios 16.4 update

Updated my iphone to ios 16.4 and once complete realised my fitness widget was no longer showing data. Then clicked on fitness app and no data was showing either. Tried turning on / off both iphone and watch but no luck. Then attempted to pair my watch again but no results. Called Apple but they said the data is basically lost, and only offered a total reset of the phone as a potential solution. The fitness ability of the Apple Watch is one of the main reasons I got it, now not being able to see any workout data is very demotivating. Any ideas?