I am so scared something is going to happen to my baby, he is the sickest he's ever been! He is so lethargic he won't…

I am so scared something is going to happen to my baby, he is the sickest he's ever been! He is so lethargic he won't wake up for long and when he does he isn't sitting up very well just seems weak. He hasn't been nursing very much, maybe 4-5 times within a 24 hour period when he usually nurses about 8-12 times. He hasn't had a wet diaper in 7 hours. His temp is 102.8 and seems to be rising! He couldn't keep Motrin down because he starting choking and coughing it up until his face turned slightly purple I thought I was losing him! This is a nightmare! If his fever gets past 103 I am heading to the ER, I just hate being out especially downtown at night alone with a baby in the dark, and I don't want him to have to endure another hour and a half car ride.