Irrational fears about hormonal imbalance

[wambam]

I am having a Paragard inserted next Wednesday and I am irrationally worried about it. I'm not worried about the insertion or the IUD itself, but about going off HBC. I've been on the pill since I was 18 and have had picture perfect periods since then - every 28 days almost to the hour, super light flow, minimal PMS symptoms. I'm worried that by going off the pill I'll screw myself up in some way and awful things will happen - acne, weight gain, etc. Before going on the pill, I was fine. Irregular, but fine. My lifestyle is a complete 180 from how it was at that time, so I'm hoping that it will be even better than pre-pill. 

Any stories to make me feel better? Feel free to virtually slap me and tell me to stop worrying. I won't be offended