This doesn't sound normal for menstrual cramp -- certainly not the pins and your chest and hot flashes.. If you took ibuprofen (by far the best thing for menstrual cramps), it should have kicked in after 20 minutes. It should be taken with food or milk, though, because it can cause nausea.
If you didn't take ibuprofen, get some and take it. If it doesn't help, call and try to reschedule the interview, saying you have a family emergency. And I think you should see a gynecologist ASAP. Your menstrual issues need medical attention. You may have endometriosis or something else causing these problems.