Ok I Would Like to ask for anyones thoughts on this...and please ...

Ok I Would Like to ask for anyones thoughts on this...and please don't feel like I am attacking anyone but tell me the truth...I am 23 years old I wasn't looking at having children however my beautiful daughter is 7 weeks old and like all of you I had the Mirena inserted last week. I am 5'5 and before I became pregnant I was 113 give or take at the end of my pregnancy I was 155, when I went in to have the mirena placed I was down to 118 and starting to fit in my old jeans again...again I said a week ago. Now like many of you I too have always had problems with my weight I have since my previous marriage I will not go too much into detail but it ended because I was 120. Now I watch my weight VERY closely and when I gain 3 pounds I am spun into a depressed state. When I first had her I was perfect even with 2 hours of sleep a night and a stomach that looked like a big floppy pancake I felt great I loved my motherly body I was not depressed what so ever. Now im not blaming the mirena yet but after reading these post im honestly scared. Before I was pregnant I was on a low hormone pill and I would get horrible migraines to the point where I would faint out of the blue they would strike and down id go Anyway...and please be honest...do you think that people who are prone to these symptoms they are simply intensified not that thats any better but is there anyway to live with them? In my past I sought out therapy and even medical treatment. I ask because My sister has the mirena and so does my neighbor...no weight gain no depression no anger no side effects what so ever. Me I already feel the weight coming on I am no longer anywhere near fitting into my jeans and I haven't eating anything for 3 days I know thats unhealthy but I need to know if this is really the cause...those of you that have had the mirena removed do you honestly feel a big improvement?