Battling a cold: Should I give a decongestant to 2 yo?

My son, 23 months old, is currently battling what seems to be a cold. It may or may not be related to teething (2 year molars). I noticed the symptoms beginning Thursday. It started with what sounded like post nasal drip (he was swallowing hard). Then his cough increased and he developed a small temp (99.8). His eyes appeared glassy and he has occasionally sneezed. Last night he did not sleep well, cryed out in his sleep on and off. I can hear the mucous is his sinuses as he sleeps. I'm thinking a decongestant or antihistamine would help dry it up so he can sleep but would that be undoing what the hypertonic saline is meant to do (rehydrate the airways)?
Source: Cystic Fibrosis Parenting Forum - Category: Respiratory Medicine Authors: Tags: Parenting with Foster Cline, MD and Lisa Greene Source Type: forums