Symptoms going off the pill

I was on the pill for about 7 years and I went off 6 months ago. The first 2 months were normal and I felt good, had my period, etc.

At the 3 month mark I noticed I had gained 15 pounds since stopping the pill, and I started to get acne, which I have never had in the past. The acne has gotten worse as time goes on.

I also have not gotten my period for those 3 months. I’m not pregnant.

Anyone else had similar issues? I’m assuming it’s just due to hormonal imbalance but it’s weird to me that it was normal for 2 months.