can't turn myself on...

So recently I've been SUPER horny. Like never before in my life. In the past when I'm like this I can usually just stimulate my clit for a little and I cum sooo fast and I loved it, but recently once I start masturbating when I have these feelings my sexdrive disappears. I can't cum even when my girlfriend is eating me out. Any tips on how to fix this? It's super annoying.