15weeks pregnant & fainting?

Shalee 🦊
Hey ladies i'm 15w 3D pregnant and I'm a little concerned. For the past few weeks I've basically been fainting. Let me explain a little. 
I get really hot, like instantly start wetting buckets hot, my hands start shaking, arms and legs become crazy weak they feel like they'll give out, my vision becomes so blurry it will go black occasionally, my ears will buzz to the point I can't hear anything not even the buzzing. On occasion I'll be sick and lose everything in my stomach, sometimes blackout for a minute or two. Then after that all passes I'll get really really cold like ice, start shaking, and feel really weak.
I'm wondering if anyone ha been through this or has any idea what's going on. This had happened maybe 4-5 times. 2 times today alone within 30 minutes. I'm planning on going to the hospital. I was just hoping for some insight or anything really. (I've had 2 MC before so I've never been this far along)