I have many of the same symptoms you are referring to: sinus pressure, my nose is completely stuffed up, my ears feel like they want to burst. I just finished 2 rounds with the zapper. The main reason I used it tonight is because I am having UNBELIEVABLE pain from an abcessed tooth. Zapping did somewhat intensify that pain like I put a live wire on it but I dozed off for a little while. When I woke up, my nose wasn't as stuffy and the sinus pressure and ears are a little better. Feeling the sensations is normal! My machine was down for a little while until I had a chance to explore it and fix it. I can touch those leads and tells whether it's working or not. I "feel it" in my fingers, hands and arms. Let's us know it is working. Now, if only that sweet little zapper truly could replace that root canaling dentist of mine!!!