Insomnia caused by occupational stress

I am a station staff member and handle customer-facing duties. As a result, I meet many customers, and sometimes I get emotionally hurt because of certain individuals. Now, since I have been working here for a very long time, I have become much more numb than when I first started, but there are still times when really exhausting people appear.

Really unreasonable demands. There are far too many people who are below common sense. I even wonder if they have families at home, as they act as if they are the ones in control. I get angry in these situations, but I can't even get mad at them, so I hold it in internally.

As these frustrations accumulated, it seems they became toxic. There are many nights when I can't sleep. I never used to sleep deeply, but lately I can't sleep at all, and even if I do, I wake up quickly and spend the night wide awake. ㅠㅠ

Sleep aids are not very helpful, and I do hear about sleeping pills, but I feel groggy all day long... Still, it's probably better to take sleeping pills, right!?