Does social fatigue ever go away?

Hi! I'm Jack.

After spending the better part of a year trying to get a job, I finally got one that I really wanted. I've been in it for four months now. It involves a lot of one-on-one talking to people about their problems and feelings.

The thing is, I get fatigued by social contact, to the point that I'm completely useless for several hours after each session, sometimes even dissociating from exhuastion. It isn't just the fact that I'm talking to people; it's the fact that the topics are stressful by nature! I'm on a zero-hours contract so I only get paid for the hours that I'm talking to clients, so I really need to be racking up more hours on the job if I'm going to earn enough to pay the rent and eat!

I really enjoy my job, and don't want to have to give it up, but if things continue this way I'll have to because currently I'm only working four hours a week and even that is making me constantly tired (I have some volunteering for something else as well, but that doesn't take up much of my time).

My question is: will this tiredness go away? Does anyone have experience of 'getting used to' social contact? My hope is that I'll build up some kind of emotional resiliance and be able to slowly take on more clients. If it doesn't go away, I might have to get a different job 

- Jack