I am student in usa and in need of money to pay fees. can I work at a store/gas station where there are few haram things to sell?

I am student of M.Sc Computer Science in USA. Origionally I am from Pakistan. I am in need of money to pay my tuition fees and other expenses. I have been looking for a clean job (where I don't have to deal with haram things) for past two months but I haven't found any yet. So is it permissible for me to work at a place (like gas-statio + convenience store) where I have to deal with haram things, like lottery tickets, cigarettes etc, until I find any other clean job where there are no haram things. If its not permissible than can I apply for an interest based loan. Even if this is not permissible than should I go back to Pakistan(my home country)if I am not able to pay tuition fee. If I go back without completing studies than I will have to sacrifice all the time and money I spent in studying pervious semesters.