Setting Up Basic Hospital Record System - Linking Forms With Patient ID Or Name?

I work for a charity in the Pacific. I am trying to develop a very basic patient electronic health record for a new hospital, to be used until we get a more comprehensive patient management system in place.

I have set up basic tables, forms, and a welcome screen.

The idea is that the doctor or nurse will start at the welcome screen. From there, they can either enter a new patient, or add a new patient encounter.

There are four types of patient encounters: assessment, treatment/surgery, refraction, and follow-up. I have made tables and forms for these encounters.

My issue is finding an easy way for the doctor or nurse to quickly and easily make sure that the encounter form they are filling relates to the appropriate patient. I already have a patient form, and patient ID field across the tables. But I would like to be able to add a 'search for patient' button on each of the encounter forms (or any other relatively easy method) to make sure everything lines up.

Database draft.zip