Soy isoflavone extracts and supplements are available as dietary supplements without a prescription in the US. These products are not standardized, and the amounts of soy isoflavones they provide may vary considerably.
This can sometimes be caused by allergies, infections, and even tumors, but it is often simply something that some people have due to their anatomy (ie, they were born with a pre-disposition to this problem). Sometimes, this clogged feeling in the ear can be a trigger for headaches. As you know, headaches can come on from almost any cause, and some people will have different things that are triggers for these headaches to start. Continued ear pain, hearing loss, and dizziness would all be potentially worrisome symptoms.
Common factors that can cause clogged ears are wax buildup, air flow blockage to the Eustachian tubes, pressure differences in the middle ear, and cold and sinus problems. Clogged ears can affect people of all ages, but is most common among children, especially when they have colds.