Oh my God donno where to start, I am breastfeeding my baby and I...

Oh my God donno where to start, I am breastfeeding my baby and I am on Mirena for a year now, I have gained 15-20 pt( although we're poor and sometimes have no food to eat), I do work out every 3-5 times per week, doing yoga and jogging, and strolling away. I started to get severe back pain, that hurt so badly that I couldn't bend.I get cramps on and off and became highly irritable and depressed. I look like a puffy balloon, my head is thinning and I am only 26...