experitation date on herbs

I have been taking echinacea & olive leaf for a cold, but that doesn't seem to be knocking it out. I'm 18 weeks pregnant now so I haven't tried anything stronger. I found some of Dr. Christopher's Respiratory Syrup in my cabinet but it has an expiration date on it of 03/08. Has it really gone bad or do you think it's still safe to use? It has not been opened. I haven't had a cold like this in ages. I think I was worn down from the morning sickness and not being able to eat well. I just got over the morning sickness and immediately got this. I don't have a lot of herbs on hand right now and would take awhile to get some in. I also have some essential oils. Any help is appreciated. Tweet