If you're looking for a well-integrated web app product that isn't something you can run locally on your computer, Picnic Health [1] is really good at this. They import all your medical records from the providers who use electronic health record systems with APIs and collect your medical records from the providers that don't use those systems or aren't as technologically savvy. They digitize everything and put it in a timeline format. Their service is not cheap though.
[1]: https://picnichealth.com/