If the chart below is right, 4.8 means an average of 86. I am no expert either, but it doesn't sound like you have a big problem and if it were me, no way I'd go on meds. I was getting fasting readings around 110 before this WOE and now they're always under 100. I don't think 100 is a bright line, either.

You are only measuring when fasting (in the morning?) and post meals? There is a lot of time between those readings when you're clearly lower (3am most likely, then the liver naturally supplies glucose and it's higher upon waking).

http://www.diabeteschart.org/mgmmol.html