I can't orgasm no matter what.

& it's annoying. He'd go down on me every night and I'd orgasm. Now, nothing. Out of nowhere. He's even put porn on & that always makes me orgasm. Nope. Didn't. He's not doing anything wrong. It feels great. My body just wont orgasm and I don't want to rely on toys cause he feels like it's his fault & if I orgasm with a toy and not him he'll get very upset. What else could we do?!?!?