Hi, I am Johan, I have a lower spinal disc...

Dear Customer
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Are the current medication should be enough to treat your pain ?
Robaxin 750 and arcoxia and both pain killers and suit your medical condition , but its also depend on the severty of your enjury , which may need more effective pain killers agents 
Other pain killers options :
1. steroids injection 
2. gabapentin 
3. pregabalin
Are those medications are easily prescribed ?
those medications especially gabapentin and pregabalin are highly nerve pain agent , but they are also have many side effects and may possibly develop addiction habits , so they are prescribed only by doctor after full assisment to your medical condition
What to do next ?
1. consult a neurology doctor to do the needed medical examination and determine the treatment pathway
2. provide any possible pre-existed medical reports and test
3. you may need more tests such as : 
- MRI 
4. doctor after reviewing your medical condition , will suggest better pain killer options as your medical condition needs 
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Kind Regards