My Email has been cracked/hacked.

To whom it may concern,
I know that something serious has happened to my email accounts with gmail. The header below was run through your validation service and it came back with troubling results. I believe it may have been cracked by an application I downloaded on the Google Play Store. I have a Samsung Galaxy S8 on the Australian Cellular Network Optus. The email that this relates to is: rohanbarfoot@gmail.com 
I have extremley sensitive data on these accounts including a few Bank Accounts correspondence, shopping and payment services, Credit Card Institutions and all my Google Drive Douments which include a copy of my passport, Driver's License, Government Tax information etc. 
If you could kindly take a look and see if this is a serious issue and the data is compromised or something else has happened. I purchaser Kaspersky just the other day and already have Samsung Knox running which is supposed to keep out all viruses. 
I realize I am passing my highly sensitive data to you and I trust that it won't be used in any harmful ways. If you know anyone that I should email this information also or if this isnt your field could you please refer me on to someone? I greatly appreciate it.
You can email me back at Rohanb416@gmail.com and CC it to Jane@peninsulagrowers.com.au 
It you need to contact me my U.S number is (213) 290-5061 or directly on my Australian Cell +61 (431) 715-344.
I greatly appreciate all your help as well as your fantastic web service I think it's the best out there and am so grateful it exists.
Thank you and Regards,
Rohan Barfoot 
The header I put Into your validation service is:
https://accounts.google.com/o/oauth2/auth?response_type=code&client_id=217779251543-nh8q39o370t9lqejmh8oq0jin76h32c3.apps.googleusercontent.com&redirect_uri=com.googleusercontent.apps.217779251543-nh8q39o370t9lqejmh8oq0jin76h32c3%3A%2Fcom.samsung.android.email.provider&scope=https%3A%2F%2Fmail.google.com+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.email&state=state&login_hint=rohanbarfoot%40gmail.com&prompt=select_account&from_login=1&as=HzHf2F99JuxFWPPpTT85Jw&pli=1&authuser=4 A direct link to the page:
https://validator.w3.org/nu/?showsource=yes&showoutline=yes&showimagereport=yes&doc=https%3A%2F%2Faccounts.google.com%2Fo%2Foauth2%2Fauth%3Fresponse_type%3Dcode%26client_id%3D217779251543-nh8q39o370t9lqejmh8oq0jin76h32c3.apps.googleusercontent.com%26redirect_uri%3Dcom.googleusercontent.apps.217779251543-nh8q39o370t9lqejmh8oq0jin76h32c3%253A%252Fcom.samsung.android.email.provider%26scope%3Dhttps%253A%252F%252Fmail.google.com%2Bhttps%253A%no252F%252Fwww.googleapis.com%252Fauth%252Fuserinfo.email%26state%3Dstate%26login_hint%3Drohanbarfoot%2540gmail.com%26prompt%3Dselect_account%26from_login%3D1%26as%3DHzHf2F99JuxFWPPpTT85Jw%26pli%3D1%26authuser%3D4

Sent from my Samsung Galaxy smartphone.