I switched over to this HRT a month ago as the one I was one previously wasn't really making that much difference. I've just finished my first pack, but for the last few days I've felt a bit odd, sick, headache, irritable, tired etc. I was sick on Tuesday morning, the best way to describe it is a cross between morning sickness and a hangover. Not meaning to sound like a hypochondriac, but I've really felt quite rough. I had covid a few weeks ago, dont know if that makes a difference.