Hi
Toby had his first cold at about 12 weeks, it's horrid not being able to help them, isn't it!
My GP surgery offers a telephone service - I would check whether yours does so you can have a chat and put your mind at ease. Ours has a policy of seeing all babies with suspected colds under the age of three months, just to rule out chest infections and anything more serious, so they may ask you to come in but it's nothing to worry about.
I second the saline nasal drops, they really work. We also used Olbas drops (the infant version) on tissues which we put in his cot (out of reach of course) and smeared a bit of vicks vaporub on the shoulders of his sleepsuit. Calpol is good to take the edge of a sore throat as well. I hear the Calpol plug in thingies are great so will be getting one of those next time.
One of the easiest things you can do is sit in the bathroom with your LO with the door closed and the hot shower running, to steam him up - works wonders! Plus lots of cuddles of course...
Good luck and hope your baby starts feeling better soon.
C