Seems like you are down with the flu itself. I am presently having the same. Doctor diagnosed me with chest and throat infections and I am undergoing treatment using antibiotics for a week. If the doctor has not prescribed the same for you, it might not be anything to worry about. Be sure to take rest and drink lots of water. Going out with friends might be a little hard on your body even if you are feeling well. I suggest that you postpone the outing to the next weekend.
I wish you all the best to get well soon.