Hi Sue...Please get yourself in to see your doctor ASAP. Call an ambulance if you need to. Forget about the 02 for now...it is your severe angina that needs immediate attention.
I see from your other posts that your CPAP treatment has not appeared to have been followed by your health professionals. This needs your attention, too...but is secondary for now. After the above has been seen after, please seek out a doctor specializing in sleep medicine to reevaluate you. Do not delay on this. On CPAP, your AHI should be under 5 each night. If it exceeds that number, then this is an indication that things are not going as well as they should with your treatment and that some kind of change or adjustment is in order. Your specialist may feel that another sleep study could benefit you. If so...go for it. Your sleep specialist will know what needs to happen and...may even be the key to getting that order for oxygen that you are seeking.
The general practioners are not specialists and they may miss the finer points of obstuctive sleep apnea and XPAP treatment. You must advocate for yourself here. The care you need is not going to just land in your lap...you must go out and fetch it.
Severe OSA...both hubby and me. CPAPin' through life.
PR Remstar System One with A Flex, 560P
Swift FX For Her Nasal Pillows mask
Oral appliance for OSA and TMJ syndrome