2 paracetamol to lower temp (I was prescribed this in hospital for this reason when I had to stay during summer a few years back because I can't control my body temp )
A frozen bottle of water on a small table in front of the fan (standing on a towel to soak the condensation up) an old coke, squash or milk bottle will do fine. Do two so you have one in the freezer whilst one is out.leave room for the water to expand a little as it solidifies in the freezer so don't fill right up to the top.
Water spray to keep spraying my face and upper body (only lasts a few minutes whilst it evaporates but it works).
Several cooling towels soaked in cold water and then placed into sandwich bags and then put in the freezer. Within minutes they're super cold. One around my neck and will be draped across my face when I finally try sleep (not knotted or tangled!) and one around my hair like a turban. When they warm up I 'snap' (like the pull pull motion in wind the bobbin up song) them to cool off again. When they warm up for the final time I resoak, put them back in the sandwich bag and into the freezer and take out the other two.
Wetting your hair also helps if you don't have cooling scarves.
Laying on a dog cooling mat with a special pillow sizedone for my head too.
Just before I get into bed for the final time I'm going to shower tepid or lukewarm (not too cold or your body will panic and overreact to warm you up) and not dry myself off properly. I'll soak a short nightie in the same temp water and put it on. It will evaporate overnight (so no wet patch) and helps keep cool. Fan on all night also helps keep cooler as the fan 'chills' the water.
Also keep drinking as annoying as it is to pee frequently and get out of bed to pee. I also use electrolyte tablets in this weather too (hi5 zero ones with a glass of squash)
Keep the curtains and windows closed all day and the windows too as the air outside is not cooler than the air inside until the evening.
I have a medical condition where I can't control my body temperature so sweat profusely all year round. This heatwave is pretty much my normal life, including winter so I'm full of "useful" ideas for cooling off 😂