Younger sex symptoms and conditions

I am 38 years old and had Mirena put in on Nov. 26th. The first two months I felt pregnant and was nauseous all the time. That seemed to go away and now I can't stop gaining weight. I am gaining about a pound a week. It is all heading toward my stomach area and it's uncomfortable. I have also begun losing hair, having yeast infections, headaches, acne and pain during sex. I wish I found this site before and wonder if anyone has had similar symptoms and do they go away. I have scheduled to have it removed in 3 weeks. I am afraid to have it removed and feel like should I give it more time. Does anyone have any advice?