Even with the current health problems and backsliding on weight, you're still way ahead of where you were when you started.
In fact, you're still down by well over 50 pounds, right? in the past year and change, right?
That, by itself, would warrant a party for a lot of people!
I know it's always disheartening to backslide; I've felt it myself. Anyone who tells you it isn't a life-crushing bummer simply hasn't been there. But it isn't the end.
Fact is, most people who successfully lose a lot of weight have one (or more) backslides along the way. It's almost inevitable. Like you've heard since the beginning - losing weight is hard, keeping it off is even harder.
Maybe your body needs a break from the downward slide... your hormonal balances and regulatory mechanisms need time to adjust to a radically different body. Among other things, your leptin levels were way down (because leptin is produced by your fat, and you had a lot less fat to produce leptin)... your brain has become accustomed to a particular level of leptin for years and years and years, and ever since you brought it down, your brain has been chemically driven to try to get you to eat more to gain fat and restore the "damaged" leptin levels.
Or maybe you psychologically needed a break from the relentless dieting... broccoli/chicken/fish, broccoli/chicken/fish, broccoli/chicken/fish, broccoli/chicken/fish, broccoli/chicken/fish... this is why we need diet breaks.
Or maybe you have a health issue that crops up that throw things off for you... I injured my back earlier this year; it prevented exercise, and I allowed myself to use it as an excuse to eat more and to eat poorly. I backslid.
Or... from the sound of it... you've had all three hitting you at the same time.
But like I said, even with the big backslide you've had, you're still way ahead compared to where you started. You'll need to wrest back control, and you'll need to re-set some of your goal dates (if you had set dates, that is), but you can still stop the slide and, when you're ready, start back on a plan that keeps you moving in a positive direction.
Good luck... we're all still pulling for you.