It would be best if you kept a log for a bit...each morning (or any other time of day this occurs). Then give it to the doctor, so he can see and understand what you're experiencing. It will help him with diagnostics to have this information. Actually, a good physician will ask you to do this for a couple weeks (daily) to see what is happening with your BP. My mother's cardiologist is having her log her BP before getting up now after passing out several times...to help diagnose autonomic dysfunction due to age (she's 85).

If it is just happening in the morning, then try a couple things to help:

1) Sit up in bed for 5 minutes before standing...just to allow the BP time to adjust the change in position.

2) Set a glass of water by the bed and drink some (at least a half a glass) before getting up. Then wait 10-15 minutes before getting up.

3) Increase your salt intake...especially the night before. Salt helps the body retain fluid, and fluid helps keep the BP up.

These may sound silly, but even if you have autonomic neuropathy now on top of your SFN, these are the types of life-style adjustments you have to make in order to compensate for the drops in BP. There are medications to help, but these should always be tried first.

I'd be interested in seeing what your readings are from laying to sitting to standing, with just 2-3 minutes in between each change.