Is this even possible?!

Well if you're eating a lot and eating high calorie foods you can certainly gain very rapidly. I took a quick peek at your diary and while it doesn't look very filled in, the entries I did see had cake, cookies, rice crispy treats and things like that. While those can certainly be a part of a healthy diet as a treat, there are days where that kind of stuff seems to make up the bulk of your food.

I know junk food can be cheap and convenient but there are ways to make healthier choices and still keep expenses down, it will take planning though. Buying produce in season will be less expensive than out of season fruit and if I had to choose between empty junk calories or non organic produce I'm thinking non organic produce is going to be a lot better for you than the junk! If you want to make better choices you will. If you don't choose to make that change though, don't be surprised if your weight continues to climb.

I am gluten free by necessity and feed my family of six on one income so I do understand the struggle to feed everyone on a budget.

If it happened, it's possible (so unless you're not accurately remembering what you weighed eight months ago, or you are using two different scales and one or both is/was not properly calibrated, it happened, so it's possible).

That works out to 6.25 pounds a month, which means you've been eating (on average) roughly 730 calories above maintenance every day. If what you're concerned about is stopping this weight gain and/or losing the weight you've gained, you're going to need to find some way to reduce your net calories, and the most feasible way to do this by reducing the calories you're consuming (you can exercise to try to burn some calories, but even the 730 to get to maintenance would probably take you more than an hour a day, especially if you're just starting to exercise and aren't able to work out at high intensity for extended periods).

MFP is a calorie-counting approach (there are other approaches, such as Weight Watchers, which uses a point system as an approximation and proxy for calories). If you want to use the MFP method, you're going to have to log your calories (and you need to do so accurately, which either means eating mostly packaged, portion-controlled foods, or getting a scale and measuring cups and spoons (but use the scale whenever possible, because it's more accurate).

Drinking water is good for you. I think some organic foods are worthwhile, others (like bananas) less so. I think fresh produce is a good thing. But none of them (not even water, other than short term by helping reduce retained water) is going to make a difference in losing weight if you're still consuming 700 calories a day more than your body needs. If you can't get fresh produce, eat frozen or canned, whatever is on sale, preferably plain, without sauce, just because there are probably more filling, satisfying things than the sauce on frozen veggies, and you could probably make a sauce much more cheaply and have control over it, but if you want the kind with sauce, and you can fit it into your target calories, go ahead.

Yes it's absolutely possible. However, today is a new day. If you want to lose it you can! Good luck.

When I went back to school in September, I gained 7 pounds in 10 days. And I drink lots of water, eat lots of veggies, and walk everywhere (and do barn chores 4 days a week, 3hrs/shift). That's when I learned: Portion size is everything!!

You've proved it's possible, now what are you going to do about it?