Hey Big guy,
Just stoppin' back in to offer up a bit of reason amongst the ego-inflation and chest beating.
I hope to GOD that you have enough sense to ignore rather than to listen to either of the PeePee brothers (penile & Paine).
(One must wonder why they are not, at this very moment, picking up their shared Nobel prize awarded due to their uncanny and unexplained ability to perfectly and immediately diagnose any and all of your existing, hidden and/or potential medical problems by doing nothing more than staring at a few words splashed across a computer screen.)
Such a gift should be shared with all humanity, I beleive, rather than squandered upon we; the semi-sentient and pathetic masses that we seem to be (according to them) here at [words=http://www.mattersofsize.com/join-now.html]MOS[/words].
But, getting back to you. If your weight gain has been somewhat unexplained and not due solely to the all-too-common laziness and overeating, (been there, done that), then a coupla tests just might be in order: Insulin resistance, thyroid, liver function and a good-old-fashioned stress-test are a few that come to mind.
A doctor/nutritionist/naturopathician/chirpractor etc. could suggest some more, I'm sure.
Human body is pretty damn complex and the list of things that can go wrong is, literally, endless. Screen out some of the more potentially dangerous factors and your progress should be that much quicker and trouble free.
It's pretty easy for someone to hide behind the anonymity of an internet forum and bloviate in absolutes (one of the easiest ways known to be both completely wrong and completely self-alienating, by the way)...but if you were to follow those guys' advice blindly and then dropped dead of a heart attack; I don't think any of us would ever be aware of it, except for your lack of further input into this forum.
(As a quick aside; I gotta say that I am actually impressed by their collective courage in displaying both arrogance and ignorance in such quantities in such a public forum.. don't you agree?)
Anyways:
Not to be insulting but your body-fat puts you into the category of "morbidly obese" ...morbidly as in: "it could kill you". Now I don't know what your finances are like or your personal disposition to doctors in general but if you can afford it and are amenable to it then I'd suggest covering at least the basics. The next 60 years or so just might be your best!
Good luck to ya, and keep us posted !