I can relate to your experience. I had the copper IUD for 5 months. My symptoms became increasingly unbearable, which is why I had it removed and now use a diaphragm and fertility monitor as contraception.
Within 48 hours of having the IUD inserted, I had a distinct yellow hue on my face, which was pointed out to me by others. It faded soon after. After those first two days, the roller coaster started. Symptoms included: depression (suicidal thoughts), anxiety, moodiness, over-sensitivity, weight gain, bloated face, increased appetite, "stress eating," heavy bleeding and cramping, lines on my face, muscle weakness, fatigue, brain fog, inability to make even the smallest decisions, inability to plan two steps ahead, inability to think creatively, and feeling totally overwhelmed. I cried all the time. This was very unlike me. I am not prone to depression.
I tried to take zinc, thinking it would counter the copper. I stopped taking it, however, because zinc made all the symptoms worse. Finally, after having the IUD removed, all my symptoms went away within a few weeks. I didn't do anything special. I just did my normal routine of a low-fat plant-based diet, jogging, and meditation. I do not take a multivitamin, which contains zinc. Instead, I take only B12, iodine, Vitamin D, and DHA.
The medical establishment thinks it's impossible to have copper toxicity from the IUD, but I disagree. If my side effects were caused by hormonal changes, I think it would have taken longer to recover. (The copper IUD does, in fact, affect hormone regulation because it promotes the release of prostaglandins.)
I wonder how many women with the IUD are also taking antidepressants. How many are trying to lose weight to no avail and blaming themselves? How many are feeling tired, weak, and numb? I wish I could warn all women against this device.