I have been sick 4 times in the last month, should I just man up and see a doctor?

Cold, flu, rash, cold… all with maybe 2–4 days in between, each one lasting at least 4 days. I currently have what I assume to be a cold, that started last week mid-week. The girl I’m seeing had a runny nose, and thats what I had first, so I assumed thats all it was and it would go away in a couple days like it did for her. Unfortunately while my nose is significantly better, I know have that overall sick/cold/fever feeling, my throat is bad, and i’m coughing flem like no other.

What could this be? Should I just cave and see a doctor? I’ve had a lot of stress the past few months so my immune system probably isn’t at its best… but I take daily multivitamins, eat fairly healthy, and have been chugging airbourne as of late.

Suggestions?