Some drugs lose their magic, others don't but you may need to account for your increased tolerance by taking a higher dosage.
Then again there is no guarantee what you consumed was hydrocodone, they might have been fake. This is less likely but I just felt like throwing this out.
Sorry to hear you aren't getting your ideal effects from your dosage but my advice to you is to quit while you're still ahead. Opiate addiction is not fun.
Also, this isn't really OD material, so I'm going to close it. Please check out the links in my signature.