I Hate People Sometimes

So a 'friend' of mine has had a go at me because I unintentionally passed out instead of skyping him after a long week of 5.30am alarms, long days at university (its my first week back and i have 3 weeks to catch up on for my current 4 classes along with an assignment i need to resit) with general duties that come with single parenthood and making sure someone i have known since childhood is ok after having fluid extracted from his lungs. I have apologised for passing out but they are getting pissed because i said 'i will skype' instead of 'i will try'. I had every intention of talking to him. I enjoy being able to and appreciate the talks, which i tell him. Lets face it, i havent had a chance to go to therapy for 2 weeks sorting all this stuff out in my life, i havent even had time to have a decent bath in 3 days.
I dont know. Am I the bad guy in this? Am i crazy for getting this upset about it?