Hi Shirleen!
I know exactly what you mean about the freezer - pre-sw mine was choc full of breaded chicken, fish fingers, frozen chips, etc etc for me and my hubby.
As the freezer has emptied i have restocked with healthier options marinated chicken portions, frozen veg bags, mccain 3% fat chips etc
Take control back

and encourage them to be healthy too! They need your support.
I am going to make the assumption that you have a car with you at work? Or a small space you can leave things in a cool bag?
Pack a cool bag with lots of fruit, pasta pot shots, mug shots etc for when you need a snack.
If i have long days I tend to have more green days as pasta and rice will keep quite well in a cool box during the day and warm up quickly in the microwave.
One thing I do cook in advance and squeeze a little of my freezer space for is home made pasta sauce - made in batches and frozen in freezer bags.
I cook pasta at home in the morning - cool it in cold water and pop it in a tupperware. I double bag the frozen pasta sauce and stick it in the cool bag too - then when i want it - i warm the pasta sauce in a cup ... and add to pasta .. and warm pasta for a minute or two. Intant sw friendly food
Bagged salad and packs of sliced meat from a supermarket .. or that no drain tuna are a blessing if you wanted a red day - again just throw it in the cool bag!
Eating out - Jacket spuds are always a good fall back, but check the menu for other tasty treats first. Tasty salads with grilled meat or fish ... ask for dressing on the side (I take my own low/no syn dressing in a little bottle if I know we're going out!)
Just a few of my survival tips.
Good luck
Surzy x