I came to this post because I too am having a rough time with constant hot flashes and night sweats. I got my Shingrix vaccine three weeks ago and it has been going on since that time. I am in perimenopause but this is FAR more extreme than anything I was experiencing day to day. I also noted that I looked everywhere for this side affect and it was not listed at all. I do not have any other health issues and this came out of the blue after my second Shingrix shot. No side effects affects occured after my first shot. It is almost unbearable. I get hot flashes once an hour or more, sometimes two or three an hour. Nights are awful because those hot flashes wake me up and I am burning up, sweating, then throw off the covers and I am freezing. I am not sleeping well and haven't for weeks. Yesterday after a flash I took my temp several times (I was feeling nauseous as well...so much so I was afraid to eat dinner) and it was weirdly low. 96.7, 96.8. The nausea passed when the hot flash passed but they just go on and on. It is awful. I am a 50 year old woman.