I suffered with anxiety since I was a child, and only once did I get so bad that I dropped 25 pounds in 1 month (and that for ME was almost 20% of my body weight! That was in 2002) I am 55, so that was many years of anxiety and only once had the weight drop like that. So depending on how bad you are worried, that will happen. And of course you are losing weight eating less. When they talk about cancer and "unexplained weight loss" - they mean just that, "unexplained" eating less is an explanation.
Googling is the WORST thing you can do. I know, I do it and am right now in the throes of MS googling (when my rational brain keeps TELLLING me that it's menopausal symptoms!), 2 months ago it was tonsil cancer googling, 2 months before that was colon cancer... it can drive you mad. I am told NOT to google!! But I can't help it! I think, "OK just one more time, I KNOW this will make me feel better... but it never does, I find bad things!" Then to test it my daughter said that her feet were cold and were the same temperature as the cold hardwood floor because she could hardly feel the floor under her feet - so for fun I googled, "Can't feel floor under feet" and the first site that came up was "Diabetic nueropathy" she does NOT have diabetes! I did this to prove something to myself - that whatever you google you'll come up with something bad.