It's getting tough

I have a goal this week to do 7 miles a day for 5 days a week and resting 2. Well I have used up my 2 days already because of my sisters events. So tonight I had to break it down some but I had no motivation to do it. I still have 2 more days to meet my goal of 7 this week and my knee is already hurting me so bad. Am I pushing myself too much. My desire to eat has drop alot some days I barely get 1200 calories. I really want to be 234 by the end of the month. I have a fear that it won't happen and it will make feel like I did all this hard work for nothing and I don't want to feel that way. I am eating healthy or as close to healthy as I possibly can.i still have 103 pounds that I want to lose right now it seems like a huge goal. I have got to do this for me and my kids. But am I pushing my self to hard?