Thanks for all of your help. I emailed the consulate and it is ok to bring CPAP and medications in original prescription bottles so long as not classified as a stimulant, narcotic or psychotropic.

Response from consulate is below:

Good morning COPLATSAT,

No, you should not need to fill out any forms for a CPAP machine. For the blood pressure medication I believe that you are free to bring in up to one month's worth of medicine without any forms. However, I would recommend you check with your doctor to ensure that your medication does fall into one of the three restricted classes of drugs: stimulant, narcotic, or psychotropic. If your doctor says that your medicine is one of the restricted kinds of drugs, please contact me again as you will need to fill out a Narcotics Form to be able to bring your medicine into Japan.

Best,

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Information and Cultural Affairs
Consulate-General of Japan in Houston