DS is also 8 months old and he just got over what we assume to be RSV. We did not get it confirmed with a lab test because his doc said it is really miserable for babies and anyway it wouldn't change the way she would treat him.
The upside to going to the ped is to get oxygen levels checked. Even if it is RSV, if the O2 levels are good than you're pretty much ok - you just manage it like a regular old cold. With my DS they were borderline on Thursday but when we brought him back on Friday they were much better. He still has a cough and sounds a little rattly, I asked the doc about it and she said it would just take time to work itself out.
I know it sucks to get hassled about not vaxing (we don't either but are lucky to have a doc who doesn't utter a peep about it), but the peace of mind you'll get from knowing your LO's oxygen saturation is good might be worth it. She also gave us three things to check for that indicate respiratory distress so when his cough got bad I could reassure myself that he wasn't doing any of the three things (nostrils flaring, rapid breaths - like 70 breaths per minute, and sucking in under his ribs like he was really having to work for air).