I'm a non resident alien, I came from Chile (Southamerica). I was hired by a company to work by hours, so I didn't get any benefits. I want to know if I can ask for health insurance deductions for last year, since I've paid my health insurance by myself every month.
Also if you can help suggesting me what other deductions I can get. I'm getting a very low salary and paying a lot of taxes!

You can claim health insurance premiums your paid directly as a medical expense. But the total of medical expenses has to exceed a percentage of income to qualify.