Hi LJ and welcome.
I'm a bit like you,been with my husband for 8 years and married for 6 of them,I was so loving intercourse,couldn't get enough if truth be told,then all of a sudden,nothing,zilch,just couldn't be bothered any more, I still love my husband obviously but like you I didn't want to tell him,still haven't,to start with I just told him I'd tummy ache or headaches etc,it's easy for other people to tell you to just tell him but for some (me) it wasn't but now,we do it less anyway,he's tired or I'm tired,it just naturally got less,so now,I'm back to enjoying it as it's only maybe once or twice a week.
I love my OH and I know he'd understand but I'm so scared he'd be hurt.
I don't know what your partner is like but you should tell him about the sweats and mood swings at least then take it from there
Good luck