10 Year old medical mystery

Good Day Every one.

I was wondering if someone might have something similiar to this.

My son is 10years old, the last 4 months has not been easy. He is sleeping constantly, he say he is dizzy, nausoius and feel like some one is sitting on his chest and numbness in hands and feet, I started taking his bp and pulse with an oximeter, his bp will drop (60/40) and go very high (184/143), his heart rate the same (37-222). He can’t go to school and he is mostly at home. We did go to the dr and Hospital, they checked his iron levels, one day it is good 10days later it is low. His sugar level dropped a month ago to 0.9 and was in hospital for 2days. They did some test and still don’t know what is going on as he is not diabetic. Currently he is being treated for sever anxiety and narcolepsy and its not working - or I feel like it is not working.

I am a single mom of 3 and I do not have medical aid.
This mommy is worried and scared as I miss my child and no one knows what is going on.

Regards