I'm afraid for my life because of a heatwave and my job
Do you work a dangerous job?
I work at night on an oil rig.
The money must be pretty good then! But if the job is not for you, it is understandable that you do not want to be in dangerous situations.
I'm trying to complain about the hot conditions I have to work in since I started this job.
I hope that the management of your company will take cognizance of your complaint.  If you think they're not doing enough and it remains dangerous i suggest you to look for something else that's more safe.