You are writing as if you are a medical practitioner!!!
You did not mention whether tuberculosis
was ruled out by all tests .
was normal ,at least one big concern of malignancy is not there.
However such gneralised lympdadernopathy can not be there without a cause.!
I know you have good medical doctors in Egypt !
Why don't you get a second opinion
,examination by another specialist and a repeat biopsy if necessary!!???