Suggestions please.

Please someone take a look at my diary and tell me what I am doing wrong. (Please disregard last week starting tuesday night as I got sick and was not eating/logging). I go to spin class min 4 times a week. I am trying to watch what I eat, attemping to eat 5 times a day smaller meals and real food. I also drink a lot of water. I have lost 0lbs - I say this because my weight will go down 4-5lbs then the next day will go right back up those same lbs. I have been doing this dance for months (prior to logging and since). I decided to take measurements instead of the scale, they havent changed. I did however notice that my stomach will increase by 2-2 1/2" from morning to night. I suffer from sever bloating and my fingers often swell. I feel like I am keeping accurate track of my sodium intake and do not ever add extra salt to anything. I am really at a loss. I was doing hot yoga before and switched to spin 4 weeks ago hoping it would jump start things. I am a little lost. I am sure I must be doing something wrong, I just cant figure it out on my own. Any help would be greatly appreciated.
- Thank you!