The curious thing here is that you state in your question that you have no problem with other sea level airports so it seems very unlikely that the usual tricks will work.
I would suggest either flying to Girona instead although there are fairly limited charter flights there and it is about 75km from Barcelona or even flying to Madrid and getting the AVE ...
Since you stated you've tried (most of) the tricks listed on "Best way to make my ears pop", the only thing I can think of is taking an allergy drug that has decongestant in it (such as cetirizine+pseudoefedrine) about a half an hour before descend begins. Soma nasal sprays may also work. You should consult a doctor or a pharmacist for more detailed ...
First of all, to quote Wikipedia "there is no conclusive clinical evidence that it is effective for treating any ailment" and it's completely unregulated.
USA: Can I travel with non-prescription medicines, or other products such as vitamins and health supplements?
Non-prescription medicines (also known as over-the-counter or OTC medicines), vitamins, ...
No. It's not on the list of the CDC recommended vaccinations for Ireland, which include:
Measles Infants (6 through 11 months old): 1 dose of
measles-mumps-rubella (MMR) vaccine before travel. This dose does not
count as the first dose in the routine childhood vaccination series.
People 12 months old or older, with no ...
In Austria, the costs for travel vaccinations are not covered by the regular health insurance, but must be paid in full by the person requesting them. Source: Austrian Government's Health Portal
Not being insured should not prevent you from getting the recommended vaccinations.
Yes. Stugeron (and all the other brands of Cinnarazine) sell as "Venta bajo receta".
Which you'd guess means that it requires a prescription, but... it doesn't, unless you are trying to get your insurance to cover for it.
Drugs that say "Venta bajo receta archivada", on the other hand, do require a prescription in every case.
No, you don't, because Ireland and Turkey do not have a yellow fever vaccination requirement.
Even in countries that do, yellow fever vaccination is required only if you're coming from an area with endemic yellow fever, which covers much of South America and Africa, but not India or Turkey.