Hi, I have been on hrt 4 nearly 5 years and I can say from my own personal experience that estrogen can cause blocked ears, I never had a problem before starting hrt and I've been plagued with it since using estrogen, I've used everol patches and I did have the side effects you describe, they did settle after a few weeks( nausea and anxiety) , but the ear thing remained but its on and off, I have cut patches in past but I found they curled up at edges and didn't stick so good, so I stopped doing it and just stuck to a whole patch, my gp told me not to cut the patches as they didn't work as well, but Ive seen lots of posts on here where women get on fine with cutting them, you haven't been on the 100 patch very long maybe give it a bit longer to settle, I know that's hard when you feel rubbish but changing things to quickly or constantly going up or down the dose will only make things worse I've done exactly that before and it made things much worse, sorry to hear you have long covid that must be awful on top of menopause symptoms and side effects of hrt mixed into it, hope you feel well soon and get some relief soon x