Yup, only guesses, but my guess here would be that if you just started this, you're doing an awful lot for just starting out, and don't appear to be taking any rest time. I was all gung ho when I started too. And I pulled more muscles than I helped. So if you've pulled or overworked something, you're going to have to let it heal up. I went through the same phase and was so worried about not exercising...that I'd never be able to start again if I stopped now. But I could still do some light exercises to keep me in the mode, and lay off the heavy cardio for a bit.
I was so intent on exercising that even when I got corns and blisters, I'd try and bandage them and run again. And the bandage would rub and rub, and I could feel the blister being rubbed raw, and I'd keep going. Not good.