I have been exploring my submissive side for 25 years. I have been a pro-sub for 7 years. In lifestyle sessions there is a depth of emotions, energy, spirituality and physical giving because I know my partners over time, they are also my lovers or highly connected to my daily life, and the play time isn't "timed", all of that very rarely happens in my professional work.
Most of my professional sessions are fun, physically nothing that is going to leave me marked more than a day, it is non-stressful play and play lasts only one hour or two. While a session has a beginning, middle and end, with a hug and kiss good-bye, I do not require aftercare from my clients and certainly not on their time and dime for these encounters. I usually drink a bottle of water, have a long shower, do things that are self-caring.
Heavy play sessions (stressful play and marking play that will engage the endorphins/adrenaline) requires me to think about my aftercare. These sessions leave me high for hours, maybe a day on those good natural drugs, so I cannot play anymore, I am done. This is why I charge more for them. Experienced players always call, text, email to make sure I am okay after playing. They are paying me to play with me, not hold my hand after. They do care, they do appreciate their opportunity to play but the very reason they seek a professional is most likely the reason they cannot stay with me for "aftercare". They may go get more ice for me before they depart. Yes, they give me a hug, a kiss good-bye, afterall we have shared something special, energy has been heavily exchanged. As a professional submissive it is part of my job to take care of myself though.
In my opinion, as part of your job, you need to do the aftercare planning. At dungeons, when I am not able to drive safely afterwards, I find a place to sit, drink water, chill for however long I need until I can drive home safely. You cannot expect a client to pay you by the hour to give you aftercare for an extended period of time. If you need to chat with someone, have a "aftercare" phone buddy you can call while you decompress. I do that.
Daily, as a professional submissive I watch my diet, I exercise, I groom, I give myself self-care daily so that I am mentally, spiritually, emotionally and physically ready to work and able to do all the parts of my job.
There is a difference in being a lifestyle style submissive and what you expect and negotiate with your Top/Dom(me)/Master and being a professional submissive. Clients pay by the hour or by a period of time and they pay to leave to go on with their lives that have nothing to do with you. That doesn't mean they don't appreciate you, think of you as special to them, send an email on your birthday, that you don't get to know them more over the years you will play together, it is simply the nature of the deal.
There are many aspects of being a pro-sub, of doing this job that you need to attend to, like assuring the room you play in is safe, that your client isn't a wacko and in my experience, that you take care of yourself physically/mentally/spiritually/emotionally before and after so that you are able to do this job as a career.