What Gives?

Today when I got up, I was up 7.5 lbs up over yesterday. After I got my hubby and son off to work, I did go back to bed, and my weight was a little less after I got up, but not enough. I didn't feel well all day yesterday, but I thought I got in all the proteins and everything I needed. Will you gain if you don't get enough food? I know that I was cold all day and I felt like someone had sucker punched me in the back. It hurt to breathe, and I have been coughing too....and I have a sore throat....It doesn't help that one day it is 90 degrees and the next will be 50 if we are lucky. At least I can say that it hasn't been so unbearably hot yet. Is it possible to gain that much overnight? Well, I guess it is. But I just wonder why so much so fast. I didn't even cheat.....that is what sucks about it. I have felt better today, but not wonderful. It has been cold and rainy all day.
I am starting injections and load days on Saturday. That was planned all along, it is not something new. I was just a little freaked out when I stepped on the scale this morning and saw that my weight was up 10 over LIW and I was doing so well keeping it right at the 2 lb mark. Wow what a setback.......Tomorrow will be better. I have made sure that I got in all my calories and water so I am hoping for a loss. Maybe I didn't get all my water in yesterday..........I don't know. I slept a lot of the afternoon. I don't know what I did, to gain but I do know that I am frustrated.
I just keep telling myself that tomorrow will be better..........