Lost data - uninstalled garmin app and reinstalled to try fix something but it's lost data like my VO2max, training status, resting calories but still has all the activities in there does any one know how to fix this? desperate!

That sounds odd. Everything is stored in Garmin Connect. What does it look like in the training status report: https://connect.garmin.com/modern/report/-1/all/last_four_weeks

Training status report is empty in both the app and website 

Your historical data should be there. It will not wipe historic data. Is it empty if you view the 1 year view?

It sounds like you logged into a different account, but why you see your activities is a bit odd. Do you see your activities for years back?

It's empty even going a year back but all my activities are there since I bought the watch it's really bizarre 

Hard to say much when we can't see what it looked like before.

There is only one activity in that list that will give a VO2 max. Cardio, Strength and Treadmill don't give you VO2 max values. Running (outdoor) will calculate VO2 max values under certain circumstances. Also Trail running if you got a watch that supports that. You need about 2 VO2 max values per week to get a training status.

I just realised I was logged into the wrong email address! I got my vo2max and performance statistics back! Thanks for the initial comment but my resting calories issue still isnt displaying. Sigh.

Great! I wonder how all the activities ended up in your account. Maybe it synced everything in the watch to the new account when it was paired.

Resting calories is the same each day:

"Resting calories consist of the minimum calories required to support your body’s basic physiological needs, as well as your age, height, weight, and gender, plus an estimate of those calories required for activities like digestion and being mentally alert."

Check that you entered all info about yourself.