Well, hydrocodone does cause constipation, but it really shouldnt be that bad since you havent been taking it for an extended period of time...However, it could have you backed up a little bit. But seeing as how you had very bad abdominal cramps, perhaps you should call your doctor and have them give you something else...or TRY your best to deal with the pain...without the pills like something like an ice pack on your face, ect...
The only thing I would suggest prune juice, lots of water, and foods that you know generally make you have to go #2

) Generally pills for pooping wont work as well as they should if you are very backed up.
Eventually, if you are truly that uncomfortable, you may have to resort to anal suppositories or even an enema. All of these products can be purchased anywhere there is a pharmacy.

)
Good luck
oh and PS.....movement, like walking around can help move the bowels along as well.