I sure understand your worry about your next appt. and what to say or do. Doctors need to listen when the breakthrough pain is too much. Hydrocodone isn't such a bad medication, there are many others that would offer you more relief.
Bring a pain journal as detailed as you can. I use a calander. I also bring my health care surrogate, when this dicussion takes place. Sometimes when another is in the room with you, you will be taken more seriously. They can back up what you are saying to your doctor. Ask for more help in a straight forward way. I hope you are seeing a bonified pain specialist. I see a doc. in the field of medicine called a physiatrist. She is a pain specialist first, and then tries to treat the whole person.
I really hope you can get more help. There is also a good link through google about how to talk to your pain specialist. It may be worth it to look it up and see what other advise can be learned. I will keep you in my thoughts and prayers. ginnie