Overheated easily?

It’s been almost 8 years since I was last pregnant, so everything feels so new again. I’m 18 weeks along and for the second time I’ve felt so overheated that I get extremely dizzy, lightheaded and I feel like I’m going to pass out. I’m not dehydrated-My water bottle is attached to my hip 24/7. I don’t think it’s my blood sugar-I’ve never had any abnormal results at my appointments and I’m not a diabetic.

Has anyone else experienced this? It’s October in Minnesota and I have my heat off and windows open constantly at home and it’s driving my fiancé crazy but I just get so hot so easily 😭