About 7-8 years ago I got a really bad cold/flu
It lasted at least 4 weeks and about 6 weeks before I felt it was completely gone. At it's peak I had to lean foreward and the snot would just keep pouring out of my nose. I thought I was going to die.
Since then I haven't really had a cold that caused me to cough or nasal congestion and mucus at all. Rather disturbing.
At first I attributed it to moving away from parents, avoiding grandchildren, and living on my own. But theres something else to it.

Now I feel the symptoms start
irritability then a headache then random sneezing and progressing to a sore throat.
In the past after this about 2-3 days later the congestion would start in my sinuses and work it's way down to my lungs until I was completly sick and coughing. Sometimes I could tell it was going down through my digestive tract as well.
but I don't progress past the first stages anymore, and it kind-of goes away.

However now every time I go out to a public area, shopping, transit, meeting, social occasion ect. When i get home I feel like a cold is comming on. I get stuffy and sneeze and a bit of a sore throat. But then it goes away and doesn't turn into a cold anymore.

I got the ful shot about 4 years ago out of fear, but it hasn't really changed anything I was like this before I got it.

Whenever I lay down to sleep my nose plugs up and the airways constrict. I attribute this mostly to the damned Dog and before that cats, but I don't feel any allergies unless I lay down to sleep.

I just want to avoid all contact with society and hope my immune system doesn't get caught off guard.