Negative numbers symptoms and conditions

I had the Mirena inserted approximately two weeks ago and I really wish I would have read this website first! The pain on insertion was probably one of the worst pains I have ever had but the cramps a few hours later were worse, I was stuck on the couch crying for the rest of the afternoon, just to put it in perspective I broke my ankle and that pain was nothing compared to this. I have had spotting since putting it in and my sex drive is at negative numbers and I am only 23 years old. So far the only side effects have been moodiness, severe cramps, spotting, and the shits. I am freaking out though after reading the posts on this website..I feel totally trapped by this thing and I don't want to gain a bunch of weight and be a moody bitch for the next 5 years. Is there any hope the mood swings will go away and I will want to have sex again?