The legal effects of resigning during probation period

I am working as a trainee for an LLC company in Dubai since May 13, 2018, but I received my appointment letter as sales coordinator on June 2, 2018.

I got my company visa only in Aug 2018. Until August, I was working on my visit visa, since the company asked me to do so. Now, I am under 6 months probation period.

My job designation on the visa is Sales Executive even though I was appointed as Sales Coordinator. I want to quit my job desperately since I am unable to handle the work pressure.

I am handling the sales coordinator as well as executive job and office jobs at the same time, but I still didn't finish my probation period. My employment contract is unlimited.

So will I get a ban or am I supposed to pay visa expenses to the company if I resign before the completion of my probation period?

Will I have to serve notice period if I resign? Also, what will happen if I am terminated?

Please answer.