Heavy and long periods from implant?

Emily
Ok so I've been on the implant since April 2015, and ever since my periods have gradually got heavier and longer. The period I just had lasted 10 days! It doesn't really seem to bother me that much as my cycle between periods seems to be quite long (I'm gonna start tracking it from now on) but when I'm actually on my period I have the usual symptoms like cramps, nausea, fatigue, cravings, muscle weakness, headaches. But when I get towards the end of my period I feel exhausted because I've lost so much blood😩I've been put on iron and folic acid tablets because I had a blood test and my iron levels were low, but not alarmingly low.  Does anyone have any advice on how to keep energy levels up during the time of the month? Or anything that might help at all?