How do i handle severe constipation?

I'm 19, and i think i have severe constipation. its been going on for 4 days know and i barely moved my bowels. Ive been taking a laxative, it barely works, i go a little but not a lot. I took glycerin suppository's, they didn't melt within an hour. i drank prune juice and apple juice, barely worked. I'm starting get a little nervous. what can i do? with detail please