this is really random, but I don't know what to think...

So recently me and my partner have had a lot of arguments, mainly because he's been accusing me of having other men round our house and I 10000000% hands down swear on his children's lives haven't, and because I keep finding women's things, that aren't mine, round the house, I.e clothes, toothbrush, lotions, earrings, make-up remover, shoes, tweezers... And he had to stay away last night in a hotel with another women, for something to do with work, I know this women personally, but all day he's been trying to make an argument with me, I came home and cooked him dinner, cleaned the house and washed his clothes, I text him to let him know dinner will be ready for when he's home and the reply I got was, "already eaten, had a McDonald's." So I ate, and then came up to bed as I was going through hot and cold sweats, dizzy, sickness, and a banging headache... He came home, watched tv, turned it off and got himself comfortable on the sofa and fell asleep.. I don't really understand what's going on? Can someone help? Advice? I think I'm going to drive myself insane...