I was asked by my periodontist to get "permission" from an ENT or
allergist or my regular doctor to get implants and a sinus lift
because of my allergies having affected my maxillary sinus.

I first went to an ENT. He refused to sign off on it, told me I should
see an allergist.

I then called another ENT. That ENT refused to even "get involved"
with giving of permission for implants.

I then went to my doctor and he said I should see an ENT.

I went to yet another ENT and he refused to sign off on it, said I
should go to an allergist to get my allergies under control, first.

The (2nd) allergist said that I should just increase my meds until my
sinuses get less inflamed. But he said "I know nothing about sinus
lifts" or dental implants.

The point is, it seems to me that ENT's SHOULD KNOW something about
dental implants, especially the aspect of a lateral, crestal sinus
lift or other types of sinus lifts.

They should be aware of it so they can advise their patients on it.

Only ONE of the 5 doctors I went to knew ANYthing about sinus lifts
for implants.

Seems to me that the Periodontal Schools should start having a "share
information day" and teach doctors - especially ENT's - about sinus
lifts, just for their general knowledge, so they can give some kind of
advice or info to their patients who may need one...

Or am I completely off base here?
Maybe my oral surgeon is the wacko for thinking an ENT or an allergist
or doctor would give consent to a sinus lift?