Welcome in H.C.M.
I had read your query and effect of mebendazole
on your neck lump, this lump is not appears to be by worm infestation rather neck lumps are most of the time are enlarge lymph
nodes.These neck glands are draining from scalp
nose ears and interior of throat as well. Culture and sensitivity of throat swab only tells about inf in throat only.
Therefore you are advice for-
1- FNAC from neck lump.
With the help of these above investigations and a thorough examination of ear, nose and throat diagnosis is possible ad same can be treated accordingly.