Frustrated with my lack of self control

So I have been trying to stay a vegan for the past 2 years.  At first, I was really gung ho.  I made special requests at restaurants, I refused food with any animal products in it, I cooked constantly, and I read labels religiously.  Now, I am getting lazy.  Gourmet cheese pizza and the simplicity of grabbing food and going is overtaking my eating habits.  I love cooking, but I am working 2 jobs and I am working on a play that both of my kids are in, not to mention family get-togethers and birthdays are never vegan friendly here.  My mother puts mayo, butter, and milk in everything when she comes to visit and no matter how many times I tell the in-laws that not all veggie burgers are created equal, they still buy the same ones at the store. I can tell my willpower is lacking from the weight gain and the lack of energy I have.  I have digestive issues as well.  When I am eating cheese and eggs my stomach tells me so.  I am hoping sharing my struggles will inspire me to get back to work on being better to myself and the the environment.  Not everyone is perfect when it comes to food decisions, but I at least need to try.