It's been many years since my last viral infection, but I don't think I had normal viral infection symptoms either. My regular ME symptoms increased dramatically though. It is kind of hard to tell the difference for some of them. Even before ME, my colds tended to be three sneezes, and feeling just a bit off for a couple of days. Colds with many days of congestion are something I vaguely remember from my youth. I always felt that my mature immune system was above average in dealing with viruses.
There was an oddity pre-ME: sometime in my early 20's, I noticed that whenever I drank some orange juice, a day or two later, I'd feel like a cold was coming on, and maybe I'd sneeze a couple of times, but next day I'd feel fine again. It was a minor thing, but it was consistent enough to finally catch my attention. I assume now that it was a bias towards type IV reactions. Something in my t-cell system was not quite normal. Maybe that's part of my susceptibility to ME.
Also, yes, I sometimes fear that I've done something that has pushed my ME into a permanently worse state. It's a reasonable fear. However, in my 18 years of ME, that hasn't happened. Any periods of much worse symptoms have been short term. Others here haven't been so lucky, so don't go too crazy on overdoing activities.