Yeah, you're right, you're not good-looking, by any stretch of the imagination. That said, you're also far from hideous and the weight loss is definitely doing you a favour mate - keep up the good work! I'd say you're a 4, maybe a 5, though I'd err towards the former.
Your nose is a little on the chunkier side, yes, but as others have commented, you could easily remedy that with surgery. I must say though, I do question what you're doing on a hair loss forum. You're what, 35? And an NW2? By most people's standards you're basically a full head.
@CopeForLife called this one right I'm afraid, your hair is the least of your worries.
The extra weight is (as you've correctly identified) by far your most damaging shortcoming. The nose is another and, truthfully, your facial bone structure isn't brilliant. Sadly, there's little you can do to ameliorate the latter, but as I just intimated, the dumpy nose is fixable. Your dress sense is also letting you down: browse through some fashion catalogues and sort that sh*t out!
I feel your gripes about the post-30 dating world, however. You're right, most of the really nice girls would have been snapped up by now. Dating well below your age range isn't really an option (as you're well aware, you're simply never going to be attractive enough for that). Perhaps you should just accept the (pseudo) inevitable and accustom yourself to being alone? Wank off to 90's supermodels or whatever it is that gets you going.
I mean that sincerely. Skirt-chasing has a significant opportunity cost, and given the amount of work you'd need to put in to have even a 10% chance of getting a girl that you fit pretty well with, it may well be that that time would be better spent elsewhere. Imagine the progress you could make professionally, if you just cut out the wifey-coursing? Anyway, best of luck with whatever you choose to do mate and congrats on the weight loss.
P.s. How tall are you? (If you're 5"8+ its unlikely to be making that much of a difference) And why are you claiming that women want 'whiter' men? I don't think your skin colour's the root of your problems. 'Whiteness', certainly the pasty, ghost-like kind is seriously overrated in my experience.