Sugar-free snacks & treats are going to be your best friend. I cook nearly all of my meals from scratch & only eat out twice a week. Produce, produce, produce! It all helps.
I'm not going to be so arrogant as to lecture you on how to eat (you're an adult and I'm certain, in the grand scheme of things you really could NOT care less about my opinion) but...
Please DO continue to prepare all your own meals. Good for you!
Aspartame has been proven to cause Grand Mal brain seizures, and in worst case scenarios, cancer.
Yes, you must consume an extravagant amount to get cancer, but when you consider how dangerous almost everything we eat and drink is, today (additives, preservatives, colorants, dangerous fertilizers, etc) it won't take long.
Phenylalanine is extremely dangerous which is why you'll see warnings about it on packages and Acesulfame - though lauded and approved by so many health-care providers, can cause extreme tummy upset and can contain carcinogens.
Your best bet is to buy a Stevia plant. They don't cost a lot and they are yummy, by popping a leaf into your tea, or drying and using in food.
Just make sure to research how to properly use it before you do! A friend of mine who lives primitive and organic as I do, handed me a leaf straight from her plant. Tasty!
I was actually heartened to read that you eat a lot of produce.
Just be sure to rinse it well (if you buy it from the store) or better yet, buy organic from approved and mandated organic farmers, if you can't grow it yourself.
People consider me a bit of an expert on organic living and have been living organic/healthy/primitive for years now and do know and have found out that you really can't trust any of the companies on the market today who make food, without extensive research.
Best of luck!