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I believe that I can help you.
If your family is always telling you that you are talking too loudly, then this is a very good indication that you actually are indeed talking too loud.
The fact that your nose is often blocked is an indication that you may have a sinus infection due to bacteria or even due to allergy.
When you have such an infection or blockage, you can also have a hearing problem, or pain behind the eyed, even sore teeth.
The next step is to simply go to your family physician and ask him or her to examine you for sinus or ear infection.
You can probably clear this up with a course of antibiotics.
Hopefully there has been no damage to your ears. If there was you would probably have pain as well.
Your GP will look into your nose and ears and will probably be able to see what is going on and if it is simple will give you either an antibiotic or a decongestant (or both). If it is more complicated he will refer you to a specialist.
You do not realise how loud you are. Since you have trouble hearing yourself (much of the sound travels through your sinus to your ears) you compensate by speaking louder so that it sounds "normal" to you, but in actuality you are speaking louder.
Yes. Exactly. I believe that you will be successful very quickly.
I wish you well and shall keep you in my prayers.
You are so very welcome. Have a lovely day.