That doesn't sound like a hardware issue at all. The people who use this forum don't work for Apple btw. Also this is the internet so you may find it useful to get a second opinion.
A digitizer is basically the glass on the exterior of your iPhone screen. The actual image and light come from the LCD screen below not the digitizer btw as they are totally seperate parts.A digitizer takes input from a user when they touch their phone to click something or make a gesture and converts that into information your iPhone can understand like exactly where you touched.
So here's the important question: Is the exterior glass on your iPhone even broken, cracked, chipped anywhere?
If not, then it's unlikely it's a digitizer issue. Doesn't sound like one to me.
What I don't understand is how someone decides it could be a broken digitizer without asking if your screen is cracked. If the issue continues you could try plugging your iPhone into a mac and viewing the log messages in the Console app although this may not be a straightforward as it could be.