Hey, So I recently had a similar problem -- had a semi-serious medical issue, had to go to a number of different medical institutions, all of which asked me for a comprehensive medical history. I was able to give them high-level answers, but some of the details were hard to recall.

I started working on an open-source project to electronically pull my medical information from various healthcare providers, and store it locally (no cloud involvement at all).

https://github.com/fastenhealth/fasten-onprem

It's definitely an early beta, only 1500 healthcare providers are currently supported, but I'm working on a big update to bump that up to ~10k. The UI is also a work in progress. I'd love to hear your thoughts!