//The sound of a windturbine has a major component as the blade passes the tower.
If the body is subject to some pressure variation of the sound, is it
possible that a nerve signal that approximates the shape of a pulse
could interfere with the nervous system ?//

An interesting conjecture. You should do some research and some experiments and then write a seminal paper which gets published in Nature.

//If it affected the middle ear could it cause a seasickness like effect ?//

Who knows?

//It is a theory, but probably worth looking at.//

No, it really isn't. It is a very weak hypothesis at best. I consider it random conjecture. To advance it to the level of theory you'll have to do a lot more testing and have it critically reviewed by a lot of fellow scientists.

Bazz,

These submissions to the Senate Select Committee on Wind Turbines by Dr Hanning, a UK noise and sleep apnoea specialist, may be of:

Dr Hanning’s Submission is No. 55 here: http://www.aph.gov.au/Parliamentary_Business/Committees/Senate/Wind_Turbines/Wind_Turbines/Submissions

Testimony by Dr Hanning is here: http://parlinfo.aph.gov.au/parlInfo/search/display/display.w3p;db=COMMITTEES;id=committees%2Fcommsen%2F4b5a8680-2178-4492-97ea-9fb2994d6673%2F0016;query=Id%3A%22committees%2Fcommsen%2F4b5a8680-2178-4492-97ea-9fb2994d6673%2F0000%22

Additional documents 25 and 26 here: http://www.aph.gov.au/Parliamentary_Business/Committees/Senate/Wind_Turbines/Wind_Turbines/Additional_Documents

What turns the blades when there is no wind?
Is it desirable to keep the machinery turning over to keep it well lubricated?

//What turns the blades when there is no wind?//

Gnomes. There is no such thing as physics, it's all done by gnomes.

//Is it desirable to keep the machinery turning over to keep it well lubricated?//

I dunno about you, but I like to 'keep the machinery turning over' at least twice a day ;)

Well Tony I am not a scientist just someone who understands the
possible implications of some technologies.
I just put it up in the air to see if someone catches it.
Just working it backwards, presume the sickness is real, at such low
frequencies the impact probably might be on nerves and some do convert
very small signals into larger signals in the nervous system, after
all that is what they are designed to do.

Perhaps those that do feel sick should rotate their beds by 90 degrees.
They might then receive a smaller signal.
I know, you think this all nonsense and it could well be.

I've heard that sensitivity to the sound of windmills shows up only in the areas where landholders are not getting paid to accommodate them. Windmills are the latest witch hunt to be sustained by expensive “Inquiries”. Here are some of the Abbott Government’s other witch hunts: Rudd doing his job as PM by steering us clear of the Global Financial Heist. Gillard doing her job as a lawyer 20 years ago. Shorten doing his job as a union official. Professor Triggs doing her job as a Human Rights commissioner has caused a witch hunt but not yet a formal “inquiry”. Could be the witch-hunters fear her answer.

There’s several commissions of inquiry that hopefully Labor might institute when it gets the chance. One is the abuse of the position of Speaker by Bronwyn Bishop. Another is to make Abbott come clean over whether or not he has occupied a seat in parliament illegally in defiance of Section 44(i) of the Constitution. A formal inquiry (with witnesses under oath) into lying in an election manifesto might also bear fruit.