Can I go to the ER for this? Type 2 Diabetes??

I'm 19 and overweight. While pregnant I had high blood pressure and preeclampsia and the weight just added up until I had gained about 80 pounds, and no matter what I do i can't lose more than 10. I have a dark ring around my neck and have frequent UTI's, get dizzy a lot and feel tired and hungry to the point where I feel like I'm dying. I have been trying to avoid this but I have a lot of symptoms of type 2 diabetes... I want to get a blood test done because I'm terrified. However I don't have a primary doctor and my only thought is to go to the ER...? Will they give me a blood test if I ask for one??? 😥😥😥😥