Sorry for posting again but I'm a first time single mum on my own ans a bit of a worrier 
My little boy is 4.5 months old and yesterday he developed a cough, he also has a blocked nose and sneezing alot and has quite raspy sounding breathing. He often sleeps through the night but last night he woke nearly every hour crying and just really really upset each time. He has also gagged on his milk a few times as he coughs when trying to drink. He drank 5 oz last night at 7pm and only 4 this morning at around 7am followed by high pitched crying (like the one when they've just had their injections) and he has now been sleeping for the last 3 hours. His temperature is fine.
Is this simply just a cold and he needs lots of cuddles and love or should I take him to the doctors?? Sorry for the essay!