Night Sweats and Vomiting, what's causing it?

So for the past 4-5 months I've been having a lot of problems with night sweats. Sometimes it's mild and just slightly uncomfortable, but other nights I wake up completely soaked and sometimes wake up in the middle of the night, have to change completely and even put a blank over my sheets because they are wet too. Which sounds gross, but it's true. And it's not like I'm even that overheated because I don't sleep with a lot of cover, just a comforter and my room is fairly cold at night.

The other weird thing that has been happening recently, especially in the past month or so is me randomly throwing up. It's usually more towards the morning (and NO I'm definitely not pregnant!) and I will sometime wake up and throw up or feel okay and then get super nauseated an hour or so later and then throw up. And sometimes it happens more than once. Even days when I don't throw up I still feel nauseous a lot. But I never have a fever so it's not like it's the flu and it never last more than an hour or so (I've never thrown up more than twice), so why is it. I eat the same thing for breakfast every day and some days it's fine so I doubt it's that. And it isn't always in the morning, it happens in the afternoon/evening sometimes too. It's just weird that both of these are happening at the same time and for such an extended time, when it's definitely not the flu.

A couple years ago I was having cluster headaches that would last seconds-minutes but would sometimes make it hard to see so I got an MRI done on my head to check for tumors and aneurysms and there was nothing. So it's not anything like that, although the cluster headaches have been getting kind of worse lately.

Any ideas would be great! I'm considering seeing a doctor if it doesn't get better soon but idk what could be causing it. I take medication for things but none of them have night sweats or nausea/vomiting as side effects.

Sorry this is so long!