If the way your T does business does not work well for you, you have to protect yourself and try another T. I would go tomorrow and discuss the whole issue of not having a set time and how it makes you feel (such that you do some acting out emailing T to ask for reassurances). If he says "see you next week" then the onus is on him to "see you next week!" If he does not show or gets mixed up or otherwise gets tangled in his own mismanaged business, then you need to take your cleaning to another cleaner!

Convert the grief and pain to anger at not getting what you are paying for, what you are asking for, what you are expecting, and discuss that and the other person can help by giving you what you are paying them for or they can show you (not just "tell" you) that your perception is incorrect or you can decide enough is enough, "I'd like to see someone who can serve me better in my life" and go find another therapist you think will serve you better?