my back problems

i think we can now exclude swimming the breaststroke as the reason for my back problems. it's quite clearly work that's doing this to me. well, not work in general, just one client. just one. it's really starting to do my head in. i feel this person on the other side has nothing better to do than kick up a fuss every single time someone is in a bad mood or only marginally enjoyed their lesson on that day. i mean, come on! it can't always be perfect. and if either the student or the teacher is having a bad day... i'm so exhausted. i could barely keep my eyes open all Tuesday. at 8.30am, i was having trouble focusing on my only 2 students. 8.30 am. i had to cancel my evening out and went straight to bed. slept 11 hours. felt better the next day, but by Thursday, i was in the same state, despite 8 hours of sleep. so once again, i went to bed early and slept another 11 hours. still tired now. i so need a holiday...