Welome to HCM
We understand your concerns.
Lower back itching may be due to some sort of dermatitis
Use some sweat powder after cleaning that area for a week or so and you will get good results.
Hiccoughs are due to the agitation or irritation of diaphragm.
This happens even when we are in sleep.
Random hiccoughs for shorter duration are normal and will subside with stomach exercise like bending.
Please consult a gastroenterologist
if symptoms persists