Hard decision treatment

So... I got diagnosed with endo. I have a large cyst in my ovary (tennis ball size), the mri showed that my ovaries have been moved together and that there might be something behind my uterus but they could not be sure. I do not have much pain, but I am mostly super tired, I think from iron deficiency due to heavy blood loss (am taking iron). Doctor says there are 2 options. 1. Removing the cyst, but as I am not in much pain it would not help my symptoms (especially tiredness) according to her. 2. Mirena iud, which she seems to prefer. I have bad experiences with hormonal birthcontrol (pill), as I felt constantly very depressed and bloated while on it long term, and when I first started taking them I would get almost aggressive for a few weeks while adjusting (would not want to put myself and my environment through that again). My question is: what are your experiences with either option in terms of reducing fatigue and blood loss? For those previously not reacting well to oral contraceptives, was Mirena different? Of course I know every body works differently, but reading experiences of others might help me decide.