I was the same way for most of my life. It was hard, but I finally sought help because I couldn't handle all of the ups and downs as they were getting too extreme for me to deal with alone.
It was the best thing I could have done because now I am on meds and dealing with everything with a great T.
Just because you passed some online tests, you need to be properly diagnosed by a professional and if you are, then you will find out and be treated correctly.
Good luck and I am here if you need it. You can PM me anytime.
BJ