Kratom may be a good, and relatively cheap option for you.
If you can tolerate it just stick with plain ground leaf. Start small and work your way up dosage wise, and figure out the best method of consumption for you personally.
Extracts are a whole different ball game and will absolutely mess with and/or block to some degree the efficacy of your hydrocodone; You may even find that the extracts work better for you than the hydro does, and getting hooked on extracts is rediculously expensive, especially compared to any kind of H you could find, albeit the extracts are possibly safer, although clearly neither are held to the same quality control standards as a pharmaceutical. Many brands of kratom have tested positive to heavy metal contents, so a trusted source is important.