Stuck between a rock and a hard place!

I suffer from endometriosis and was told in so many terms that i either have an hysterectomy or the Mirena IUD fitted. I am 31 and would(if possible)like to have children so there was no option really. I had the Mirena fitted a very long 4 weeks ago and after a very painful fitting i drove home thinking the worst part was over. I was creased up in pain during my journey and took painkillers on my arrival at home. I am told i have a very high pain threshhold, and as usual, continued to suffer in silence. Some 48 hours later the cramps were still unbearable and the blood loss continued. I eventually visited my GP days later, who told me i had had a very bad fitting. He checked everything was in the right place and advised me to ring him should i get any worse. I had to return a week later and was put onto hormone tablets to try to stop all periods for a while. My doctor explained to me that my body was rejecting the Mirena, and i should try the tablets for 30 days to give my body a chance to accept the foreign body. I have continued with the tablets and have a little while to go but my current symptoms are:

weight gain(despite being totally off my food for the first 3 weeks after fitting due to nausea)
acne(something which i did not suffer through puberty)
Serious boating(none of my clothes fit me and i look at least 6 months pregnant)
Abdominal cramps daily
Severe fatigue
Very low mood (i'm concerned my GP suggests this is depression)
Inability to concentrate at work, cannot even follow a book.
Memory loss
Self conscious about facial appearance-acne, bags under my eyes, aged appearance.
Dizzy spells, trembling etc
Hot sweats
No interest in work, social life, general day to day tasks.
Feeling of worthlessness

I want to sit and cry all the time, yet my rational side is telling me i have a lot of loved ones, a good life, successful career etc, things i feel i can't be a part of anymore. I feel as though i have been in a dream world since the thing was fitted and i'm in two minds as to what to do next. I am used to lots of pain caused by the endometriosis but at least i know what that is, i don't know whether to give this more time to settle yet risk further complications in the future or to have the IUD taken out without delay. Anybody had a similar experience or have any suggestions? They would be very welcome.

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