I don't think you're getting worse, or not getting better. I really don't believe that rating is a very good indicator of your playing ability. For example, an extremely good player may have some bad days, and drop to a lower rating than he should, while another player may not have improved, but may have gotten lucky one day and jumped to a rating higher than he should. Since you probably will also have good tournaments alongside the bad tournaments, your rating will eventually even out and only then will you know whether you are improving.
For example, you said you lost over 100 ELO points. Don't panic so much about it - just take your time, and keep doing what are you are doing, and I think your rating will go back up.
I don't get it. Every day (with few exceptions) I am doing all or most of the following:
1) Play several games of chess online or against Chessmaster
2) Spend at least 30 mins solving tactical puzzles (right now using S. Polgar's book on Chess for Champions)
3) Playing through OTB at least one game from Chernev's "Logical Chess Move by Move"
4) Reviewing my losses and looking for errors
5) Have a FIDE Master analyze some of my losses
Yet my rating is not going up. In fact, after a series of defeats very recently on chess.com I have fallen over 100 ELO points!
I'm putting the time and effort in, so I can't figure out how I seem to be getting worse...
Cheers, Chessoholicalien