oh, god, sorry, i read it as you thought the tictacs were bingeing.
so, he told you you'd failed and you binge-ate o prove him right?
that's not helpful.
You'd done so well and you let a nasty comment bring you down.
you need to tell him he's being a twat for not supporting you and that he never should have bet you to set you up for failure.
and I agree with the other poster that you need to change your lifestyle, not give yourself a restrictive diet.
you've put on weight mostly because of your medication.
you obviously can't stop your medication, so look at other things.
are you being more sedentary? ie are you sitting around in the evenings? are you doing it because you're more tired or because you can't be arsed? if it's the latter, then you need to put that aside.
have half an hour to relax when you get home in the evening before dinner, have dinner, then go a walk, or play an active computer game, or do a bit of "light cleaning" 
- and not just you - both of you need to do it together otherwise you will resent him for being a lazy arse when you're putting effort in.
food - look at your portion sizes. It's not just what you eat, it's how much. If you're piling it up and eating it all, of course you'll put on weight. I'm not saying eat tiny portions, but just cut it down. instead of 3 potatoes, have 2, and have more veg if you think you'll be hungry.
watch how you cook things - don't use lots of fat to cook - if you fry stuff, use Fry-lite or similar - you spray a couple of sprays into the pan instead of a glug of oil. have boiled instead of roasted veg.
if you eat pizza, make your own and don't put so much cheese on it.
if you eat meat, cut off the skins of chicken and the fat off pork etc.
roast them in a pan with a grid underneath rather than in their own fat.
change to semi-skimmed or skimmed milk. don't have sugar in your tea (you can cut down rather than do it all in one go - i used to have 2 sugars and now have 1level spoon, and i can't stand more sugar nowadays)
If you normally have pudding after dinner, change the pudding, or havea smaller one. If you have ice-cream, have a ice lolly instead, or if you have cake, research recipes for low fat cakes.
eggs have fat in their yolks - so if you normally have 2 eggs, then cut it to one.
if you eat pastry - instead of pastry, have bread - pastry has loads of fat in it. (eg, pitta bread or pizza bread, or english muffins etc)
if you make a pie, make it with mash instead of pastry. when you make mash, make it without butter. (if you like, you can add herbs to it instead of just having it plain - use milk to mash it anyway)
take up an exercise class if you can. belly dancing is good fun, and they welcome wobbly bellies (i know, i am one - our class has women of all shapes and sizes)