Hi Tiviana
This is how I would handle it. Other mommies might have different suggestions.
Increase your sons feed, give him 75ml at a time. Make sure he finishes the bottle even if you have to wake him if he doze off. That should stretch the time between feeds. I found when Dewald is nigly something is bothering him or he is hungry, So I check everything, try and give him something to drink, check his nappy, wind him, check his temperature, wipe him off and massage him with lavender cream. After that he normally sleep soundly. Try and catch a nap when he is sleeping, I know it is almost impossible, but you going to have to try. Clean the cord until it is completely dry, otherwise it might get infected.
I hope your difficulties will soon pass.