Obtain a permanently bound notebook. A regular composition notebook will do. Write the date somewhere in each entry, preferably the top. Record the basic facts of each event along with any special notes. Include any advice you receive with names of those present.
If you decide to make control charts, you can create simple time line charts in your notebook. More involved charts will probably require software.
One website you will want to look at is when evaluating your medical record history is http://www.hhs.gov/ocr/privacy/hipaa/understanding/consumers/index.html.
More information on charting to come...