Actually, it sounds like you are having a very common "reaction" to the high potency work of the IF#2. It will pass... along with a LOT of gunk that has been stuck up in your colon.
For about a week when I first started taking IF#1/2 regularly, I passed nothing but mucous. It was gross. You just have to be patient and let your body do its thing. The headaches are probably some old toxins being loosened up and moving through your bloodstream as you begin to detox. That's definitely what the tiredness is. You're asking your body to do a deep cleaning, and you know what it's like when you pull down your curtains to wash them and they are all dusty- dust gets everywhere!
Once I had some IF#2 with some juice, didn't drink it all, and left the glass out to sit overnight. The IF#2 expanded overnight to over twice its size, and became the consistency of a soft sponge. I was like, "Oh, really?" and I let it sit a second night just to see. The next day it formed a dome over the top of the glass and looked like black caulking foam. So through that experiment I learned that you have to keep IF#2 moving through your body with IF#1 or it can expand in your colon and cause bloating. At the same time, it really does "sponge" up the old fecal material and adsorbs toxins from the lining of the colon and bloodstream as the blood passes through the colon.
Keep at it, great first day. I'd say increase your liquids, and experiment with increasing your IF#1. Are you eating Superfood, too? This will really help with the energy factor. You'll notice a spike around day 4-7.